PDF malware analysis — malicious · b95dff68607561c8

MALICIOUS

PDF

43.8 KB Created: 2021-06-03 12:12:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)

MD5: 53fc81c1aaa01c9e75b83fc458260fef SHA-1: 8ecf3044e1d0b59b9aa2e42d69d7ad50c71c9e71 SHA-256: b95dff68607561c86eed69213d365b98142a9a2086ccf25c817d037a7a68b403

82 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document displays a fake CAPTCHA to trick the user into clicking a link, which is a common social engineering tactic. The embedded URI points to a URL that is likely used to download a second-stage payload. No scripts were extracted from this sample, but the presence of a fake CAPTCHA and external links strongly suggests a malicious intent to deceive the user.

Machine Learning

Nyx PDF Classifier malicious score 0.9865

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.online/app/431946152/roblox-prison-life-hack-game-hack
- https://ifef.es/ckfinder/userfiles/files/how-do-i-get-minecraft-for-free_GM479516143.pdf
- https://ifef.es/ckfinder/userfiles/files/coin-master-free-spins-2021_GM406889139.pdf
- https://ifef.es/ckfinder/userfiles/files/hack-coin-master-free-spins_GM406889139.pdf
- https://ifef.es/ckfinder/userfiles/files/free-robux-codes-2021-real_GM431946152.pdf
- https://ifef.es/ckfinder/userfiles/files/free-coins-and-spins-for-coin-master-game_GM406889139.pdf
- https://ifef.es/ckfinder/userfiles/files/free-script-executor-roblox_GM431946152.pdf
- https://ifef.es/ckfinder/userfiles/files/free-coin-master-spins_GM406889139.pdf
- https://ifef.es/ckfinder/userfiles/files/free-game-pack-coin-master_GM406889139.pdf
- https://ifef.es/ckfinder/userfiles/files/free-robux-group-payouts_GM431946152.pdf
- https://ifef.es/ckfinder/userfiles/files/coin-master-online_GM406889139.pdf
- https://ifef.es/ckfinder/userfiles/files/coin-master-free-spins-link-deutsch-ios_GM406889139.pdf
- https://ifef.es/ckfinder/userfiles/files/roblox-games-to-play-for-free_GM431946152.pdf
- https://ifef.es/ckfinder/userfiles/files/free-minecraft-capes-no-mods_GM479516143.pdf
- https://ifef.es/ckfinder/userfiles/files/how-to-get-free-robux-on-android_GM431946152.pdf
- https://ifef.es/ckfinder/userfiles/files/coin-master-apk_GM406889139.pdf
- https://ifef.es/ckfinder/userfiles/files/free-robux-hack-us_GM431946152.pdf
- https://ifef.es/ckfinder/userfiles/files/flame-gg-free-robux_GM431946152.pdf
- https://ifef.es/ckfinder/userfiles/files/giftrobux-com-generator_GM431946152.pdf
- https://ifef.es/ckfinder/userfiles/files/minecraft-cheat-client_GM479516143.pdf
- https://ifef.es/ckfinder/userfiles/files/how-to-get-free-outfits-on-roblox_GM431946152.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_off00004d83.bin` `5e27598196ddec3056faeb5761fa0e429ce89ed72c87360c40fc0d5901184e0e`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4D83	25412 bytes
`font_01_sfnt_off00008838.bin` `407d6fb8d9efb45a2b1cddcfd151d3a069902e857cdd2d484da7c19786549282`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8838	18456 bytes

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