Malicious PDF — malware analysis report

Static analysis result for SHA-256 d837083df4f96b5f…

MALICIOUS

PDF

33.7 KB Created: 2021-07-03 15:25:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: c743ebf21b93792937bb5d5b5773d967 SHA-1: 053dd221654007503fa6c4560a1c02782191afc1 SHA-256: d837083df4f96b5fd250cc9b747df3d325255b3c8c7ea99b6de0e7bb5b08965f
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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/info-roblox-com-robux-game-hack PDF link annotation
    • http://www.digilib.uim.ac.id/repository/roblox-free-executor_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-robux-hack_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/ways-to-earn-robux_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/blox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/get-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-robux-no-verification-no-download_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/hack-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-robux-exe_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/hacker-tools-for-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-cheats-free_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-mod-version-free-download_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-buy-clothes-in-roblox-xbox-1-free_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/roblox-promo-codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-robux-videos_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DE5 22056 bytes
SHA-256: 8d9f6b266431d4f686d1f7f2629384d3be6a0ab468ffdd59213a025bed11b003
font_01_sfnt_off00005ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EF1 18884 bytes
SHA-256: 33869e0793667af56f7d6ba87793124f619ba1ae35730a4dd1e79e07104d3564

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