Malicious PDF — malware analysis report

Static analysis result for SHA-256 af3ac29788c57c8d…

MALICIOUS

PDF

42.0 KB Created: 2021-05-16 04:10:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 210ab99649857defe019c742d47fbfd8 SHA-1: 194490d05754955dfd95f2fa0e734bdab1b59492 SHA-256: af3ac29788c57c8d0beba0a852a31af18cb96270e140780b89d15433be6f527b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that lead to known malicious redirector infrastructure, specifically promoting "free generator / game hack" lures. The primary link identified is https://netcdn.xyz/app/406889139/20-free-spin-link-coin-master-game-hack. While no scripts were directly extracted, the PDF structure and heuristic firings strongly indicate a malicious redirector designed to trick users into downloading further malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/406889139/20-free-spin-link-coin-master-game-hack In PDF document text
    • http://westt.com.br/ckfinder/userfiles/files/coin-master-free-spins-hack-link_GM406889139.pdfIn PDF document text
    • http://westt.com.br/ckfinder/userfiles/files/coin-master-cheat-codes-free_GM406889139.pdfIn PDF document text
    • http://westt.com.br/ckfinder/userfiles/files/free-coin-master-androd-cheats-2021_GM406889139.pdfIn PDF document text
    • http://westt.com.br/ckfinder/userfiles/files/hack-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://westt.com.br/ckfinder/userfiles/files/minecraft-pocket-edition-free-ios_GM479516143.pdfIn PDF document text
    • http://westt.com.br/ckfinder/userfiles/files/how-to-get-free-food-for-foxy-in-coin-master_GM406889139.pdfIn PDF document text
    • http://westt.com.br/ckfinder/userfiles/files/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://westt.com.br/ckfinder/userfiles/files/how-to-download-minecraft-for-free-on-windows_GM479516143.pdfIn PDF document text
    • http://westt.com.br/ckfinder/userfiles/files/how-to-get-robux_GM431946152.pdfIn PDF document text
    • http://westt.com.br/ckfinder/userfiles/files/how-do-you-get-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://westt.com.br/ckfinder/userfiles/files/coin-master-free-link-2021_GM406889139.pdfIn PDF document text
    • http://westt.com.br/ckfinder/userfiles/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://westt.com.br/ckfinder/userfiles/files/games-in-roblox-that-give-you-robux_GM431946152.pdfIn PDF document text
    • http://westt.com.br/ckfinder/userfiles/files/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • http://westt.com.br/ckfinder/userfiles/files/rewards-roblox_GM431946152.pdfIn PDF document text
    • http://westt.com.br/ckfinder/userfiles/files/free-robux-pin-codes_GM431946152.pdfIn PDF document text
    • http://westt.com.br/ckfinder/userfiles/files/coin-master-time-hack-2021_GM406889139.pdfIn PDF document text
    • http://westt.com.br/ckfinder/userfiles/files/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://westt.com.br/ckfinder/userfiles/files/coin-master-free-spins-link-blogspot-april-2021_GM406889139.pdfIn PDF document text
    • http://westt.com.br/ckfinder/userfiles/files/how-to-get-free-coins-in-coin-master_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_off00004900.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4900 25144 bytes
SHA-256: d2cef891e01d21a4d1795b8d792f27a1ff41dab5f9ff179971e1bfb3e0c37832
font_01_sfnt_off0000819a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x819A 18352 bytes
SHA-256: 4dd766e4f27b72d6e8e66c439aca94e2b7f3531775cf9d126f518490910b573e

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