Malicious PDF — malware analysis report

Static analysis result for SHA-256 904b7c545fc3554b…

MALICIOUS

PDF

44.6 KB Created: 2021-06-09 02:19:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 646c8e373a65340a4ebf4abdade3ba84 SHA-1: 1ae44d693e10f9df089080ee6e65b8658d884900 SHA-256: 904b7c545fc3554bd8a7d80a683153069f5cb41b6afc7a694a6c0bf794a92aa1
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains numerous links to websites and other PDFs that promote game hacks and generators, such as for Roblox and Coin Master. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm designed to attract traffic or distribute malware. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.tw/app/431946152/roblox-gamepass-hack-game-hack PDF link annotation
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/coin-master-hack-xyz-download-free_GM406889139.pdfIn PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/free-roblox-injector_GM431946152.pdfIn PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/master-coin-hack_GM406889139.pdfIn PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/coin-master-free-spin-now_GM406889139.pdfIn PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/get-free-spins-on-coin-master-links_GM406889139.pdfIn PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/hack-my-game-xyz-coin-master_GM406889139.pdfIn PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/tryrbx-site-free-robux_GM431946152.pdfIn PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/how-to-get-free-minecraft-coins_GM479516143.pdfIn PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/coin-spin-link_GM406889139.pdfIn PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/coin-master-unlimited-free-spins_GM406889139.pdfIn PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/how-to-get-hacks-on-minecraft_GM479516143.pdfIn PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/coin-master-hack-ios-cydia_GM406889139.pdfIn PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/minecraft-pe-texture-packs-free-download_GM479516143.pdfIn PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/coin-master-email-rewards-link_GM406889139.pdfIn PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/earn-free-robux_GM431946152.pdfIn PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/free-tiktok-likes-app_GM835599320.pdfIn PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/coin-master-free-spins-haktuts_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_004_off0000512e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x512E 25260 bytes
SHA-256: aa8c38a7dac20009531ba4dad49035775b50711482dc2777a1cc8dfaedc0200e
font_01_sfnt_off00008a86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A86 18620 bytes
SHA-256: 2be7ef1cf4fd12e7a976f52b53ce848e2b15a17c1de4c9ab57c0c0943229d46a

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