Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcd3ff1815ec6d5e…

MALICIOUS

PDF

43.3 KB Created: 2021-05-10 22:04:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 7fd5d50669ec1021e5c45ad33bbcc03c SHA-1: ef9f5a63ca03a1eb274a86326eaff025d272df24 SHA-256: fcd3ff1815ec6d5ea897f1407fd34cb2374646d4a446108766f366f9525eb575
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to websites offering game hacks and free in-game currency, a common lure for phishing or malware distribution. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm designed to attract users through search engines. The ML classifier also strongly indicates maliciousness. The document body, though partially corrupted, contains references to game hacks and URLs, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/free-spins-coin-master-unlimited-game-hack PDF link annotation
    • http://mohacad.com/images/games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://mohacad.com/images/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://mohacad.com/images/roblox-got-talent-piano-hack_GM431946152.pdfIn PDF document text
    • http://mohacad.com/images/como-hackear-juego-coin-master_GM406889139.pdfIn PDF document text
    • http://mohacad.com/images/coin-master-how-to-get-free-pet-food_GM406889139.pdfIn PDF document text
    • http://mohacad.com/images/free-robux-just-click_GM431946152.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-get-free-robux-games_GM431946152.pdfIn PDF document text
    • http://mohacad.com/images/hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://mohacad.com/images/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://mohacad.com/images/free-robux-rewards_GM431946152.pdfIn PDF document text
    • http://mohacad.com/images/how-to-make-roblox-clothes-for-free_GM431946152.pdfIn PDF document text
    • http://mohacad.com/images/robux-match_GM431946152.pdfIn PDF document text
    • http://mohacad.com/images/wwwcoin-master-hack-apk_GM406889139.pdfIn PDF document text
    • http://mohacad.com/images/coin-master-free-spins-today-new_GM406889139.pdfIn PDF document text
    • http://mohacad.com/images/coin-master-online-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://mohacad.com/images/free-robux-discord_GM431946152.pdfIn PDF document text
    • http://mohacad.com/images/how-many-levels-are-in-coin-master_GM406889139.pdfIn PDF document text
    • http://mohacad.com/images/today-coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • http://mohacad.com/images/coin-master-free-spins-2021-app_GM406889139.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_off000047d1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47D1 30364 bytes
SHA-256: 40eb4b1a909d05a3671bd510eedc18b95e07e4ba4757b6f75fb90dd0c89df859
font_01_sfnt_off00008616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8616 18580 bytes
SHA-256: 8aad0f2405ec9a3272b05944b48a23572f7af0293916013bea6eee8874d320e7

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