Potentially Unwanted Programs often install a search assistant (or rather a browser and search hijacker) on people’s machines. This one redirects the user ends up on the door step of the famous Angler exploit kit. Malwarebytes Anti-Exploit users are protected against this latest exploit.
Popular adult site RedTube.com currently has a malicious iFrame loaded on their site, redirecting users to malicious pages. Resulting in a trusted site with high notoriety and non-malicious reputation can potentially infect millions with all kinds of heinous malware.