How do spam sites analyze user requests and issue false links?

Question

Search Engine Optimization

It's interesting to know how spam sites read the request to offer him to download a virus - a general principle
Well, that is, they adapt to the errors that I can enter and offer to go to a phishing page.
And how is the analysis of requests itself implemented in order to issue pages from the site that may not exist on it - that is, under the route template, throw a page that I can hypothetically request, but which leads to a different place on the site?

Answer 1

There is an opinion that requests are simply parsed through these your wordstats, etc. keyword statistics services. And then just generating pages or redirecting to a page with substitution of titles, headings, passages in the text...