Malicious PDF — malware analysis report

Static analysis result for SHA-256 255801f692e4a8a0…

MALICIOUS

PDF

35.2 KB Created: 2021-07-05 13:09:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7e15e26b68bd5571e4da7c7e74cc2559 SHA-1: a9bf6771eec923649e0aeed6f490d04ee489fea7 SHA-256: 255801f692e4a8a01e6c2238e2c96bb3e83c946ff8256ab4be22b5c72d6e4861
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high-risk heuristic firing for a game hack redirect lure, pointing to the URL http://netcdn.tw/app/406889139/coinmaster-blogspot-game-hack. This URL is embedded within the document body and is presented as a call-to-action. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, but the primary attack pattern is a phishing lure to a malicious external resource.

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/406889139/coinmaster-blogspot-game-hack PDF link annotation
    • http://lib.uho.ac.id/library/repository/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-earn-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-premium-free_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-hack-ios-no-jailbreak_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-pc-no-survey-no-verification_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/minecraft-modded-client_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-shirt-templates-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/mcpe-master-free-coins_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-spins-11-01-2021_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/daily-reward-me-robux-for-free_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-online-generator-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-do-you-earn-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-hack-songs-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/pubg-uc-buy-ksa_GM1330123889.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-minecraft-gift-codes_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/universal-minecraft-converter-free_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/pubg-uc-94fbr_GM1330123889.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
stream_002_off0000324c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x324C 23132 bytes
SHA-256: 0e2518576aae5974ded768684cd59b52bf7f69e1fbe2bdca3c37f1a19c06e1f0
font_01_sfnt_off00006656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6656 18560 bytes
SHA-256: c633d1bdcec2ec97d0cf5d0105340ca0f72dc1a1e70e85eb1730fe196c137425

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