Malicious PDF — malware analysis report

Static analysis result for SHA-256 530b26dde9df76af…

MALICIOUS

PDF

44.7 KB Created: 2021-06-08 09:14:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 07316af8a3fe78034fa29042b77c3d4e SHA-1: 7abb3f1b5afde8dfa58c73d3a651029f65c917f4 SHA-256: 530b26dde9df76af936731c999ea8192797fcf2303908ab4ed9243eeb1c5a9da
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are SEO-optimized and point to game-related cheats and hacks. The document body and extracted URLs suggest a lure to a malicious website, likely for credential harvesting or malware distribution. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/how-to-get-a-free-private-roblox-game-hack
    • http://repository.unla.ac.id/repository/coin-master-70-spin-link-2021_GM406889139.pdf
    • http://repository.unla.ac.id/repository/oprewards-com-robux_GM431946152.pdf
    • http://repository.unla.ac.id/repository/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdf
    • http://repository.unla.ac.id/repository/how-to-get-minecraft-for-free-on-laptop_GM479516143.pdf
    • http://repository.unla.ac.id/repository/daily-free-spins-coin-master_GM406889139.pdf
    • http://repository.unla.ac.id/repository/coin-master-game-hack-app_GM406889139.pdf
    • http://repository.unla.ac.id/repository/free-pet-snacks-coin-master_GM406889139.pdf
    • http://repository.unla.ac.id/repository/coin-master-free-spins-no-generator_GM406889139.pdf
    • http://repository.unla.ac.id/repository/free-robux-without-any-verification_GM431946152.pdf
    • http://repository.unla.ac.id/repository/free-robux-only-username_GM431946152.pdf
    • http://repository.unla.ac.id/repository/coin-master-free-spins-and-free-coins_GM406889139.pdf
    • http://repository.unla.ac.id/repository/como-hackear-coin-master_GM406889139.pdf
    • http://repository.unla.ac.id/repository/how-to-earn-free-robux_GM431946152.pdf
    • http://repository.unla.ac.id/repository/how-much-robux-can-you-get-with-1-million-dollars_GM431946152.pdf
    • http://repository.unla.ac.id/repository/minecraft-building-hacks_GM479516143.pdf
    • http://repository.unla.ac.id/repository/free-robux-android_GM431946152.pdf
    • http://repository.unla.ac.id/repository/how-to-get-free-robux-on-roblox_GM431946152.pdf
    • http://repository.unla.ac.id/repository/easy-way-to-get-free-robux_GM431946152.pdf
    • http://repository.unla.ac.id/repository/minecraft-games-to-play-for-free_GM479516143.pdf
    • http://repository.unla.ac.id/repository/free-robux-games-that-actually-work-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005183.bin
61806a3d4bc1217f612d4d5f52071e860b0436b4b98295b04827aadf2ce85893		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5183 24940 bytes
font_01_sfnt_off00008a90.bin
817c65839aa4a868c2bab0a4c8ad15f40660fc6fda07c1de5fd1cca8c9e42884		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A90 18832 bytes

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