Add attributes to attachment links wp_get_attachment_link

add_attr_attachment_link.php

function add_attr_attachment_link($html){
    $attr = array(
// array of attributes
    );
    $html = str_replace('<a','<a '.join(' ',$attr),$html);
    return $html;
}
add_filter('wp_get_attachment_link','add_attr_attachment_link',10,1);