Malicious PDF — malware analysis report

Static analysis result for SHA-256 c72c71884b51ad3d…

MALICIOUS

PDF

49.5 KB Created: 2021-06-08 17:02:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: f50084bcc8e531b0cb03507ccd07dc0c SHA-1: 9b4ba8d32a2a43f9ebe0e0e0feea3e45b3ed21c7 SHA-256: c72c71884b51ad3ddedf7e6b60876d97fc07109f969f01c9cfa64c550bf73b1a
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 0.9796

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 https://netcdn.tw/app/431946152/free-cods-free-roblox-obc-or-robux-game-hack PDF link annotation
    • http://www.fkunismuh.org/perpustakaan/repository/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/working-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/coin-master-free-chest-link_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/coin-master-hack-download_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/pubg-uc-avatar-hd_GM1330123889.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/cheats-for-coin-master_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/minecraft-pe-hack-client_GM479516143.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/roblox-adopt-me-hack_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/how-to-get-free-gold-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/como-sacar-buen-puntaje-en-juego-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/coin-master-free-spins-link-download-hack_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000053e4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53E4 26952 bytes
SHA-256: 3763745f411a4284c115369013f66e887bcae83ae2a7ba204b65aeb20650b70c
font_01_sfnt_off0000921f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x921F 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off00009ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9EC7 18260 bytes
SHA-256: 3c17a1cfd69af7a901e33792a1030658c1453ef293cf09f19947ab23b013173e

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