Unfortunately it still can “see” the hyperlinks even “through” an overlaying image.

We did not test an approach to place a transparent object (a vector rectangle) over the hyperlink and to assign a dummy PDF script handler to it. But I think it would result other visual flaws.

So the only existent workaround is to damage a hyperlink representation: i.e. to pre-process HTML and to insert a space character after “http://”.