Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a3cbf9f78687a19…

MALICIOUS

PDF

42.1 KB Created: 2021-05-11 13:05:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 03c42dfb1cb608b49f32c6fa3448a4bc SHA-1: a24f7dc30d20ee824993e88a2956c42557fd2017 SHA-256: 8a3cbf9f78687a19315bd43abc3fb2a62a2861f2790236e9aae7f4c2abf4b137
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a callback-phone (TOAD) lure. 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 0.9971

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/479516143/minecraft-diamond-finder-hack-game-hack PDF link annotation
    • http://www.riverkennet.org/uploads/files/files/hack-coin-master-32-mod-apk_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/free-coins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/minecraft-net-download-free_GM479516143.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/free-draw-roblox_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/download-hacked-games-coin-master_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/free-spins-coin-master-2021-no-verification_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/scary-larry-roblox_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/minecraft-free-download-no-virus_GM479516143.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/how-to-make-a-minecraft-pe-server-for-free_GM479516143.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/coin-master-how-to-get-free-pet-food_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/hacked-roblox-game_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/www-free-robux-com_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/coin-master-free-cards-2021_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/robux-free-robux_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/roblox-land-free-robux_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_003_off00004999.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4999 24608 bytes
SHA-256: fe132ced3167bf57c36dae1105125ba348ec419ec2e3cba90a795d963f6eb699
font_01_sfnt_off00008196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8196 18484 bytes
SHA-256: 265962787b73e694aac7c67ed987488fc8d8021a4c66c1127c37ccae154b779c

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