Malicious PDF — malware analysis report

Static analysis result for SHA-256 826f8c596a778200…

MALICIOUS

PDF

35.0 KB Created: 2021-06-21 12:14:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 38856f4729123e353f0f5fa5d3553ae3 SHA-1: 43c6f05f6f5383b1d12e8c75fe39de8cda2a4b19 SHA-256: 826f8c596a7782009719720f33fcb71b14b567406eb5a547fca1e7c5774e657f
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.co/app/406889139/coin-master-latest-version-hack-game-hack PDF link annotation
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/free-robux-offers_GM431946152.pdfIn PDF document text
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/coin-master-tricks-and-hacks_GM406889139.pdfIn PDF document text
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/tiktok-free-jeton_GM835599320.pdfIn PDF document text
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-link-31-march-2021_GM406889139.pdfIn PDF document text
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/free-robux-script_GM431946152.pdfIn PDF document text
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/is-free-robux-real_GM431946152.pdfIn PDF document text
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/get-roebucks-com_GM431946152.pdfIn PDF document text
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/free-roblox-boy-hair_GM431946152.pdfIn PDF document text
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/how-to-hack-golden-card-in-coin-master_GM406889139.pdfIn PDF document text
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/minecraft-pe-hacked-client-download_GM479516143.pdfIn PDF document text
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/girl-roblox-avatar_GM431946152.pdfIn PDF document text
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/free-minecraft-capes-no-mods_GM479516143.pdfIn PDF document text
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/free-catalog-maker-roblox_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
stream_002_off00003452.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3452 22544 bytes
SHA-256: 72dccb5bc479bb2effd49929bcf2f569b4ac464a77cfd3af7c90d7e68783f4cb
font_01_sfnt_off0000667f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x667F 18140 bytes
SHA-256: a9e8470a6ff9ffe956151425c7fda0f1cece6269167d4df22c16351a2ed4f3ca

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