PDF malware analysis — malicious · 8ac258c06aa22efc

MALICIOUS

PDF

45.5 KB Created: 2021-06-10 22:01:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)

MD5: f71d99f63fe23cf740f0d8309b0bc083 SHA-1: 75874db7490d6b1c58dd59076ffea11a5ed4415f SHA-256: 8ac258c06aa22efc6dfb35b4935583ddbdcd0ae190b1f4ba4807b037962fa459

82 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The document displays a fake CAPTCHA or human verification prompt, a common lure to trick users into clicking malicious links. The embedded URL, https://netcdn.tw/app/431946152/ultimate-game-365-free-robux-game-hack, likely leads to a second-stage payload or scam. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

Nyx PDF Classifier malicious score 0.9864

Heuristics 4

Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA

Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
External URI info PDF_URI

PDF contains an external URL action
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL https://netcdn.tw/app/431946152/ultimate-game-365-free-robux-game-hack
- https://xiangquan.com.tw/image/data/files/free-robux-accounts_GM431946152.pdf
- https://xiangquan.com.tw/image/data/files/free-roblox-clothes-and-hair_GM431946152.pdf
- https://xiangquan.com.tw/image/data/files/wahoo-gaming-co-free-robux_GM431946152.pdf
- https://xiangquan.com.tw/image/data/files/roblox-free-robux-hack-no-survey-no-download_GM431946152.pdf
- https://xiangquan.com.tw/image/data/files/free-robux-that-actually-works-2021_GM431946152.pdf
- https://xiangquan.com.tw/image/data/files/free-spins-for-coin-master_GM406889139.pdf
- https://xiangquan.com.tw/image/data/files/how-can-i-get-free-robux_GM431946152.pdf
- https://xiangquan.com.tw/image/data/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdf
- https://xiangquan.com.tw/image/data/files/free-spins-coin-master-2021_GM406889139.pdf
- https://xiangquan.com.tw/image/data/files/coin-master-cards_GM406889139.pdf
- https://xiangquan.com.tw/image/data/files/cool-free-minecraft-skins_GM479516143.pdf
- https://xiangquan.com.tw/image/data/files/roblox-robux-hack-generator_GM431946152.pdf
- https://xiangquan.com.tw/image/data/files/20-free-spins-coin-master_GM406889139.pdf
- https://xiangquan.com.tw/image/data/files/minecraft-ore-finder-mod_GM479516143.pdf
- https://xiangquan.com.tw/image/data/files/youtube-how-to-get-free-robux_GM431946152.pdf
- https://xiangquan.com.tw/image/data/files/free-robux-app-real_GM431946152.pdf
- https://xiangquan.com.tw/image/data/files/hacks-for-roblox-prison-life_GM431946152.pdf
- https://xiangquan.com.tw/image/data/files/download-apps-for-robux_GM431946152.pdf
- https://xiangquan.com.tw/image/data/files/coin-master-free-spins_GM406889139.pdf
- https://xiangquan.com.tw/image/data/files/coin-master-free-spins-2021-hack_GM406889139.pdf
- http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_004_off00005251.bin` `bf6bba11ebf8f2e05e2166ac39fb7220fb87d95ffa138b2fa91b168f1dd0fcfa`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x5251	24936 bytes
`font_01_sfnt_off00008bd4.bin` `955f52024eb691986f2f85eccea7f7eee2ee54ab79b95c62d8e719ad6865f15a`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8BD4	19464 bytes

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