Malicious ads appears on Last.fm after advertising network Zedo serves up malicious content. Courtesy Malwarebytes Google shut down malicious Web attacks coming from a compromised advertising network on Friday. The move follows a security firm's analysis that found the ad platform, Zedo, serving up advertisements that attempted to infect the computers of visitors to major websites. In an attack that ended early Friday morning, visitors to Last.fm, The Times of Israel, and The Jerusalem Post ran the risk of their computers becoming infected as Zedo redirected visitors' systems to malicious servers.