I believe that you can do this by poisoning the DNS or XSS cache .
For DNS poisoning, it will still say knowledgenotebook.com in the url. With XSS, I think it should have a new URL.
What do you mean randomly? How will user X be redirected, but users Y and Z will not? If this is what you mean, then they could randomize it using XSS. I do not think this can be randomized using DNS poisoning ...
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