The term get-rich-quick alone is a little too broad.
A get-rich-quick scheme is a plan to obtain high rates of return for a small investment. The term "get rich quick" has been used to describe shady investments since at least the early 1900s.
Most schemes create an impression that participants can obtain this high rate of return with little risk, and with little skill, effort, or time. ... Some forms of advertising for these schemes market books or compact discs about getting rich quick rather than asking participants to invest directly in a concrete scheme.
The article goes on to include pyramid schemes, Ponzi schemes, and advance-fee (aka Nigerian Prince) scams as examples.
Since you use both words internet and marketing three times each in the question, we need to a narrower term, to specify the type of get-rich-quick scheme.
In David Robinson's article in The Telegraph the term internet marketing is used 17 times. Some snippets:
...scores of internet marketing coaches ... promise to teach total beginners how to find riches online. But to learn their secrets you'll need to splash out on workshops, DVD sets and courses.
The term "internet marketing" can be confusing. On the one hand it refers to the legitimate promotion of products and services on the web as done by thousands of companies every day. However, it also refers to a sprawling unregulated industry that offers to help ordinary people start online enterprises and make money.
Clearly internet marketing is also a very broad term -- encompassing honest, ethical practices -- so it, too, needs to be narrowed down.
Thus, I propose internet-marketing, get-rich-quick scheme
or possibly get-rich-quick internet-marketing scheme.