I have no suspicious Extensions and the search engine for the omnibox is set to google. I am uploading the scan logs from Zemana Antimalware....the problem persists.
It sorted out when i ran Zemana antimalware for 2-3 times. I suppose it requires 2-3 subsequent scans with rebooting. Everythings fine for now , my chrome is clean and no more malicious ads. A big thank you to TwinHeadedEagle for giving their precious time.