Indirect ambush marketing is when an advertiser who is not an event officlal sponsor benefits from the event exposure and success without breaking the event organizer’s rules.
Most often, contrary to "classic" ambush marketing, indirect ambush marketing is done outside the event area. Indirect ambush marketing can be done at close proximity or on traditional advertising media. Some forms of hashtag hijacking and real-time marketing can also be seen as indirect ambush marketing.
Indirect ambush marketing can also be seen as parasitic or opportunistic marketing.
Some examples of indirect ambush marketing: