Oil producer Canadian Natural Resources CNQ.TO posted a better-than-expected profit for the second quarter, buoyed by higher oil prices, which rebounded from pandemic-driven lows. Aug 5 (Reuters) - Futures for Canada's main stock index rose on Thursday, as positive corporate earnings helped investors look past risks around rising inflation and a global jump in coronavirus infections. The Toronto Stock Exchange's S&P/TSX composite index .GSPTSE ended 0.2% lower at 20,329.73 on Wednesday.