Malicious PDF — malware analysis report

Static analysis result for SHA-256 2577804574c491ca…

MALICIOUS

PDF

34.8 KB Created: 2021-06-20 03:36:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 444464fae5ad01a91255f24dcb2cacf3 SHA-1: fdd1628b8613f9a707610a8f95a89c3b8fde246b SHA-256: 2577804574c491ca47ad95844b23fc8c877baacabd26825aad5bce683773374a
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are structured as SEO-optimized links to other PDFs, suggesting a link farm or content-loading mechanism. The ML classifier and PDF heuristics strongly indicate malicious intent, likely to redirect users to external sites for downloading further payloads or engaging in scams related to popular games. The presence of a 'download button' heuristic further supports a deceptive user-interaction workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/blacksburg-bloxburg-roblox-free-game-hack
    • http://muslib.unmus.ac.id/repository/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdf
    • http://muslib.unmus.ac.id/repository/moonactive-coin-master_GM406889139.pdf
    • http://muslib.unmus.ac.id/repository/roblox-longest-super-fun-obby-cheats_GM431946152.pdf
    • http://muslib.unmus.ac.id//repository/hey-google-how-do-you-get-free-robux_GM431946152.pdf
    • http://muslib.unmus.ac.id/repository/coin-master-free-spin-app-apk_GM406889139.pdf
    • http://muslib.unmus.ac.id/repository/free-robux-no-verification-required_GM431946152.pdf
    • http://muslib.unmus.ac.id/repository/free-games-like-roblox_GM431946152.pdf
    • http://muslib.unmus.ac.id/repository/roblox-cheat-codes-for-elemental-war_GM431946152.pdf
    • http://muslib.unmus.ac.id/repository/app-for-free-spins-on-coin-master_GM406889139.pdf
    • http://muslib.unmus.ac.id/repository/how-to-get-free-robux-for-real_GM431946152.pdf
    • http://muslib.unmus.ac.id/repository/roblox-free-download-google-play_GM431946152.pdf
    • http://muslib.unmus.ac.id//repository/robux-fun-hack_GM431946152.pdf
    • http://muslib.unmus.ac.id//repository/coin-master-daily-free-spins-link-today-twitter_GM406889139.pdf
    • http://muslib.unmus.ac.id//repository/roblox-hack-2021_GM431946152.pdf
    • http://muslib.unmus.ac.id/repository/minecraft-free-download-mac-full-version_GM479516143.pdf
    • http://muslib.unmus.ac.id/repository/free-pet-in-roblox_GM431946152.pdf
    • http://muslib.unmus.ac.id/repository/coin-master-free-daily-spins-link-2021_GM406889139.pdf
    • http://muslib.unmus.ac.id//repository/tiktok-free-or-paid_GM835599320.pdf
    • http://muslib.unmus.ac.id/repository/roblox-phantom-forces-hack_GM431946152.pdf
    • http://muslib.unmus.ac.id/repository/coin-master-2021-free-spins-link-2021_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000031eb.bin
542d38db61ec66559be589d51c114e075a6e42694ec1b7da2955269adf9439b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x31EB 22264 bytes
font_01_sfnt_off0000637c.bin
447a87730d0439a80eb54c1b98e2397b96a4d858904151dac5bb511ad0bf6fdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x637C 18960 bytes

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