Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a3ecabd2c3dc70…

MALICIOUS

PDF

49.7 KB Created: 2021-05-13 20:37:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: f1271c379c37b995a662c828fa43efdd SHA-1: fde3a4631ec6e2055b77eabb441cd25163c94e92 SHA-256: b4a3ecabd2c3dc70b17e6dec5cd18a94e4642028e62d49caafe80adae70c49d2
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 0.8642

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.xyz/app/406889139/coin-master-daily-free-spins-link-today-game-hack PDF link annotation
    • http://mohacad.com/images/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://mohacad.com/images/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • http://mohacad.com/images/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://mohacad.com/images/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • http://mohacad.com/images/minecraft-survival-hacks_GM479516143.pdfIn PDF document text
    • http://mohacad.com/images/coin-master-hack-pc-cheat-engine_GM406889139.pdfIn PDF document text
    • http://mohacad.com/images/coin-master-free-spins-generator-no-verification_GM406889139.pdfIn PDF document text
    • http://mohacad.com/images/free-links-coin-master_GM406889139.pdfIn PDF document text
    • http://mohacad.com/images/coin-master-spin-link-today_GM406889139.pdfIn PDF document text
    • http://mohacad.com/images/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://mohacad.com/images/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://mohacad.com/images/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • http://mohacad.com/images/minecraft-free-download-windows-10_GM479516143.pdfIn PDF document text
    • http://mohacad.com/images/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://mohacad.com/images/cute-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://mohacad.com/images/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://mohacad.com/images/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • http://mohacad.com/images/how-to-make-roblox-clothes-for-free_GM431946152.pdfIn PDF document text
    • http://mohacad.com/images/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://mohacad.com/images/roblox-hack-ios_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b8e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B8E 27712 bytes
SHA-256: 5c91b4337b03ceed79bb5af38e1a37f19ce9e3a8c8483354b6394ad0152716bc
font_01_sfnt_off00008a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A2F 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off000093e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93E0 18652 bytes
SHA-256: b7acebacf47409c7f0f2932ba41e4c1dc120b4ef5280387cf9333091bd47b2e0
font_03_sfnt_off0000b70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB70D 3264 bytes
SHA-256: e32c06502c11b52acb5e814091c5fdbffd1e2a904ac7a9cfb8b5b180bd139088

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