Malvertising is almost as good as hacking the site on which the malicious ads appear, without actually having to break into that brands web servers at all. Ad servers often push out content to many different customers, or to numerous brands belonging to one company. The compromised ad servers had a global impact, with 15,000 different Sophos users from all over the world reporting their browser had come across a malicious ad. Mal/Iframe-AR was part of an infection campaign that started in June 2015, targeting Revive Adserver.”]