RolandJS wrote:How are those negative done? Are there any solutions against such things?
Building mass numbers of backlinks with spammy looking keywords in the anchor text will make a site appear to be a potential spam site trying to manipulate serps. The only defense is to have a really solid backlink profile already before it happens. Google is well aware of these tactics and will usually disregard such things for well-established sites with a good profile.
If it does seem to have an effect you can generate a disavow link list to submit to google letting them know you had no control over the creation of such links. I had to do that once when my site suddenly gained 100,000 links overnight all from some strange link wheel thing that was just duplicating the same content over and over onto hundreds of sites (they had scraped my url from wikipedia).