Bad links or so called malicious links pointing to your site can cause serious damage to the ranking of your website. There is not much you can do if a person or a black hat SEO company does that. As the competition gets tougher out there in the net it can hit anyone.

But there is hope. Until Google finds a way of finding the darkies, you have to check the links pointing to your site(moz.com, Google Tools,…). If you find some then use the Google disvow┬áto neutralize them.

And …. Make sure you choose a White Hat SEO company!