Malicious PDF — malware analysis report

Static analysis result for SHA-256 e42b7c1f31cad180…

MALICIOUS

PDF

34.3 KB Created: 2021-06-25 23:03:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: a98cf5eb205e9412664c5788a6f71c21 SHA-1: 73dbf4998ee16d39084c9453ac60cc9529100ba7 SHA-256: e42b7c1f31cad18096ced6ece3f82eead80b7e78b6b873af01f9f558c1b97c47
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The document presents a fake CAPTCHA or human verification prompt to trick the user into clicking a link, which is a common social engineering tactic. The embedded URL http://netcdn.co/app/431946152/free-robux-generated-game-hack likely leads to the download of a second-stage payload. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/free-robux-generated-game-hack
    • http://elibraryfk.unjani.ac.id/elibrary/repository/lots-of-robux_GM431946152.pdf
    • http://elibraryfk.unjani.ac.id/elibrary/repository/roblox-top_GM431946152.pdf
    • http://elibraryfk.unjani.ac.id/elibrary/repository/coin-master-free-spins-link-may-2021_GM406889139.pdf
    • http://elibraryfk.unjani.ac.id/fkrepository/repository/how-to-hack-roblox-2021_GM431946152.pdf
    • http://elibraryfk.unjani.ac.id/elibrary/repository/crack-roblox-hack-download_GM431946152.pdf
    • http://elibraryfk.unjani.ac.id/elibrary/repository/hack-kill-roblox-phone_GM431946152.pdf
    • http://elibraryfk.unjani.ac.id/elibrary/repository/hack-to-get-free-spins-on-coin-master_GM406889139.pdf
    • http://elibraryfk.unjani.ac.id/fkrepository/repository/hilton-hotels-lua-c-roblox-hack_GM431946152.pdf
    • http://elibraryfk.unjani.ac.id/elibrary/repository/free-coin-master-spins-and-coins-for-daily_GM406889139.pdf
    • http://elibraryfk.unjani.ac.id/elibrary/repository/coin-master-free-spins_GM406889139.pdf
    • http://elibraryfk.unjani.ac.id/elibrary/repository/hack-bee-swarm-simulator-roblox_GM431946152.pdf
    • http://elibraryfk.unjani.ac.id/elibrary/repository/coin-master-tricks-and-hacks_GM406889139.pdf
    • http://elibraryfk.unjani.ac.id/fkrepository/repository/robux-hack-tools_GM431946152.pdf
    • http://elibraryfk.unjani.ac.id/fkrepository/repository/haktuts-coin-master-free-spins_GM406889139.pdf
    • http://elibraryfk.unjani.ac.id/fkrepository/repository/roblox-hack-2021_GM431946152.pdf
    • http://elibraryfk.unjani.ac.id/elibrary/repository/best-level-7-roblox-hacks-2021_GM431946152.pdf
    • http://elibraryfk.unjani.ac.id/elibrary/repository/coin-master-free-spin-and-trading_GM406889139.pdf
    • http://elibraryfk.unjani.ac.id/elibrary/repository/cheat-manager-free-robux_GM431946152.pdf
    • http://elibraryfk.unjani.ac.id/fkrepository/repository/minecraft-ps4-free_GM479516143.pdf
    • http://elibraryfk.unjani.ac.id/elibrary/repository/free-spins-generated-from-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002fa4.bin
ffb104a5c52757b1823489519d7922f58078c38d88fd95064a29994a15b20c1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2FA4 22200 bytes
font_01_sfnt_off000060eb.bin
2befb1d5480ebc934b70b08bd4479154153d708b0f9be756d8cf3c300f34c32c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60EB 18996 bytes

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