Malicious PDF — malware analysis report

Static analysis result for SHA-256 2141390bdd37368d…

MALICIOUS

PDF

35.0 KB Created: 2021-07-04 02:38:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: ec4419fdb29766bab26fe1e7842dfc29 SHA-1: c93aff4db8f7349159b553052ee674782aa4b83b SHA-256: 2141390bdd37368dd94a175e6f49b8fc71294434b6ecce60afa630a8751adae0
142 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs that form a link farm, likely intended to direct users to malicious websites offering game cheats or exploits. The document body and heuristics indicate a lure for 'Free Robux' and game hacks, with a call-to-action button and password-protected archive lure suggesting a multi-stage download or payload delivery. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.tw/app/431946152/free-robux-pin-codes-game-hack
    • http://library.fk.upnvj.ac.id/repository/coin-master-3533-android-hack_GM406889139.pdf
    • http://library.fk.upnvj.ac.id/repository/secret-roblox-hack-revealed_GM431946152.pdf
    • http://library.fk.upnvj.ac.id/repository/roblox-xxtrefetrxx-is-hacking_GM431946152.pdf
    • http://library.fk.upnvj.ac.id/repository/how-to-hack-someone-roblox-profile_GM431946152.pdf
    • http://library.fk.upnvj.ac.id/repository/roblox-free-robux-no-human-verification_GM431946152.pdf
    • http://library.fk.upnvj.ac.id/repository/minecraft-kill-aura_GM479516143.pdf
    • http://library.fk.upnvj.ac.id/repository/coin-master-hack-tool-v1-9-download-free-pc_GM406889139.pdf
    • http://library.fk.upnvj.ac.id/repository/robux-hack-generator_GM431946152.pdf
    • http://library.fk.upnvj.ac.id/repository/how-to-get-hacks-on-minecraft_GM479516143.pdf
    • http://library.fk.upnvj.ac.id/repository/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdf
    • http://library.fk.upnvj.ac.id/repository/how-to-hack-on-roblox-mad-games_GM431946152.pdf
    • http://library.fk.upnvj.ac.id/repository/daily-coin-master-free-spins_GM406889139.pdf
    • http://library.fk.upnvj.ac.id/repository/free-robux-promo-codes-for-roblox_GM431946152.pdf
    • http://library.fk.upnvj.ac.id/repository/earn-free-robux-on-roblox_GM431946152.pdf
    • http://library.fk.upnvj.ac.id/repository/how-to-get-free-robux-2021-no-verification-no-scam_GM431946152.pdf
    • http://library.fk.upnvj.ac.id/repository/coin-master-daily-free-spins-link-facebook_GM406889139.pdf
    • http://library.fk.upnvj.ac.id/repository/free-robux-no-human-verification-and-no-survey_GM431946152.pdf
    • http://library.fk.upnvj.ac.id/repository/coin-master-daily-free-spins-blogspot_GM406889139.pdf
    • http://library.fk.upnvj.ac.id/repository/free-roblox-account-with-robux-and-password_GM431946152.pdf
    • http://library.fk.upnvj.ac.id/repository/coin-master-free-spins-hack-but-no-surveys_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003102.bin
4189596d8ea95c4fe3681850114ce9ad56b0794af75660ab6ee1d87b89e34f4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3102 22628 bytes
font_01_sfnt_off00006384.bin
b916e76fe98bff6fd0474f051ff5e3faedde5306faa8896ed70e0070047acaf1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6384 19164 bytes

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