The advertising preferences have changed, putting massive pressure on marketers to bring forward impactful advertising sources. In a previous study, the endorsers such as social media influencers were found to be the most effective strategy at this time. Relatively, the endorsers’ attributes, namely source credibility and source attractiveness, increase the advertisement’s success rate by influencing people’s attitudes and intentions. The millennial is reported as the most relevant generation to embrace the more substantial concern of interacting with social media, which is also seen as a generic group that emphasizes the environmental issue. According to Google’s report, the internet searches for ‘How to live a sustainable lifestyle’ have increased 4,550 per cent in the first quarter of 2020. This study is aimed to scrutinize the effect of social media influencer attributes towards attitude and pro-environmental intention. The data collection method was distributed using a purposive convenience sampling of 300 datasets and analyzed using IBM SPSS 25 and Smart PLS 3.0. The result of this study confirmed the attitude to mediate between exogenous and endogenous variables. An in-depth review of the implications, limitations, and future study are further discussed.