Malvertising

It seems as though there is a new threat on the web .... MALVERTISING. (Malicious advertising).

Trend Micro:

"Surprisingly, users do not necessarily have to click on an ad to trigger a Web threat."

"viewers may be quickly redirected from the original site to a different site, which initiates a malicious adware download through browser vulnerabilities—a process known as drive-by-download."

Link to Trend Article
Trend Micro Malvertising Threat Prevention