Hidden links .... is this positive or negative seo?

In a web 2.0 code I discovered some hidden links and was trying to figure out it's purpose and how it works.
Is this link sabotage? Can someone explain it?
thanks


I can't figure out how to post the actual code, but it's something like this: * replaces .

div - a class target=blank - url > keyword. keyword: keyword. keyword ... < anchor >
www*<b>xxxx</b>.<b>com</b>/~name/<b>main</b>.htm url xxxxx.com ... Blog.xxxxx*com xxxxx.<b>org</b> Bookstores, Reviews & Publishers xxx Books xxxxxx... div class="Source"
url here/xxxxxx.pdf </div>

hi mate ,

Hidden links google considered by negative seo of your sites.....! so avoid hidden links