Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef4fe730b63f9e56…

MALICIOUS

PDF

34.4 KB Created: 2021-06-22 10:25:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 058378467687c6f8f02706d14ff7aa3f SHA-1: 84d8a285d40fac56b465cd28bcd8fbe2ae60d887 SHA-256: ef4fe730b63f9e56057857aab10b840c9d59c43227ebbb95aefbbef50f71646a
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure related to game hacks, specifically directing users to 'http://netcdn.co/app/431946152/roblox-hack-com-game-hack'. This URL is flagged as a redirector for game hacks, indicating a likely attempt to trick users into downloading malware or visiting a malicious site. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

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.co/app/431946152/roblox-hack-com-game-hack PDF link annotation
    • https://www.bhyllsacreprimaryschool.org/admin/ckfinder/userfiles/files/tiktok-app-install-free-jio-phone_GM835599320.pdfIn PDF document text
    • https://www.bhyllsacreprimaryschool.org/admin/ckfinder/userfiles/files/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://www.bhyllsacreprimaryschool.org/admin/ckfinder/userfiles/files/is-roblox-being-hacked-2021_GM431946152.pdfIn PDF document text
    • https://www.bhyllsacreprimaryschool.org/admin/ckfinder/userfiles/files/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • https://www.bhyllsacreprimaryschool.org/admin/ckfinder/userfiles/files/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.bhyllsacreprimaryschool.org/admin/ckfinder/userfiles/files/coin-master-jackpot-hack_GM406889139.pdfIn PDF document text
    • https://www.bhyllsacreprimaryschool.org/admin/ckfinder/userfiles/files/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://www.bhyllsacreprimaryschool.org/admin/ckfinder/userfiles/files/minecraft-bedrock-edition-pc-free_GM479516143.pdfIn PDF document text
    • https://www.bhyllsacreprimaryschool.org/admin/ckfinder/userfiles/files/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • https://www.bhyllsacreprimaryschool.org/admin/ckfinder/userfiles/files/minecraft-hacks-ps4_GM479516143.pdfIn PDF document text
    • https://www.bhyllsacreprimaryschool.org/admin/ckfinder/userfiles/files/free-games-like-coin-master_GM406889139.pdfIn PDF document text
    • https://www.bhyllsacreprimaryschool.org/admin/ckfinder/userfiles/files/free-robux-only-1-step_GM431946152.pdfIn PDF document text
    • https://www.bhyllsacreprimaryschool.org/admin/ckfinder/userfiles/files/free-coins-app-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.bhyllsacreprimaryschool.org/admin/ckfinder/userfiles/files/my-roblox-avatar_GM431946152.pdfIn PDF document text
    • https://www.bhyllsacreprimaryschool.org/admin/ckfinder/userfiles/files/roblox-free-clothes-hack_GM431946152.pdfIn PDF document text
    • https://www.bhyllsacreprimaryschool.org/admin/ckfinder/userfiles/files/how-do-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.bhyllsacreprimaryschool.org/admin/ckfinder/userfiles/files/how-to-download-synapse-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.bhyllsacreprimaryschool.org/admin/ckfinder/userfiles/files/robux-money_GM431946152.pdfIn PDF document text
    • https://www.bhyllsacreprimaryschool.org/admin/ckfinder/userfiles/files/tiktok-free-credit_GM835599320.pdfIn PDF document text
    • https://www.bhyllsacreprimaryschool.org/admin/ckfinder/userfiles/files/robloxfun-com-generator_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_off00003169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3169 21808 bytes
SHA-256: 943792d0bdb15b4ab50acb02a8835c6e1cadd86d2dd70cb9f398e2f4d5c3eaeb
font_01_sfnt_off000061ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61AC 18916 bytes
SHA-256: 6d04b5b4db5b45e378875975e26f0e3af663697016fd07aaaf83c18ceb43a6ca

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