Proxy.allsearchapp.com is totally a fake search engine, manually removal guide: http://guides.yoosecurity.com/remove-proxy-allsearchapp-com-redirect/
This malicious webpage is a browser hijack redirect that can damage your system and browser. Many victims try to search something on this website but they finally get some no-relations results such as some webpages about advertisement or porn, which contain viruses and Trojans in it. This browser hijack redirect can change your Internet setting easily, your homepage can be replaced by Proxy.allsearchapp.com and you cannot change it back. Once it is installed to your system, you will be redirected to other malicious website when you go online, and this annoying thing can create lot of pop-up that make you annoyed. This webpage is totally a browser hijack redirect that can be one of the most dangerous hijack, it should be removed completely from your computer, or your machine will be in a unsafe situation.