Malvertising is the practice of placing malware or malicious advertising into seemingly legitimate online advertising. It's a common phenomenon and a nuisance. As the internet becomes more personalised, malvertising also becomes more targeted and difficult to intercept.
Research from Bromium, shows that 50% of malvertisment is on News & Entertaiment websites. Malvertising is particularly difficult to track and prevent as ads may only appear for a short time. Advertising is now more targeted than ever.
The complexity of online advertising means that big names such as The Onion, New York Times and Spotify have all hosted Malvertising.
Read more about Malvertising here: Most malvertising attacks are hosted on news and entertainment websites
The report from Bromium here. Optimized Mal-Ops: Hack the Ad Networks like a Boss (.pdf)