MALVERTISING

Malvertising — or malicious advertising — is a relatively new cyberattack technique that injects malicious code within digital advertisements.
Difficult to detect by both internet users and publishers, these infected ads are usually served to consumers through legitimate advertising networks

An Example of Malvertising is given below:-

RoughTed is a malwertising campaign that was able to circumvent both ad-blockers & anti-virus solutions through a series of dynamic URLs. The criminals behind RoughTed leaveraged a complex ad exchange network, as well as Amazon cloud infrastructure and it's content daily network (CDN) to carry out this attack.