Bhd4.xyz/search enters your system along with potentially unwanted program (PUP) and it will bombard you with hundreds of ads, including banner ads, pop-up ads, in-text ads, video ads, sound ads, etc. Since it entered your computer, it acts as plug-ins, banners, extension, or add-ons attached to your browsers and then, all your online activities are under surveillance. And you will suddenly receive many relevant ads by Bhd4.xyz/search accordingly.
If you think that is all and the Bhd4.xyz/search redirect virus is just annoying but dangerous, you are too naïve. Although adware cannot serve as a virus, it will open the back door for virus and sometimes it can be used as a tool for cyber criminals. It can cheat your money without trace. When you are shopping online, chatting with friends, or searching via Google, Bhd4.xyz/search will begin to monitor your behaviors and detect your key words or personal preference. And then, it sends you numerous relevant ads with the intended content. When you are attracted to clink it, the ads will lead you to a strange websites which bring you virus or freeware.