Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c94a1359b7df934…

MALICIOUS

PDF

41.0 KB Created: 2021-05-15 01:07:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: eb8c7908dc1b46e93f94454164d20569 SHA-1: 35785b796d441363e00e0747e7d2a25b43780e1f SHA-256: 3c94a1359b7df934aa5af50bf5b7f6ec79066a303b5f392a82ec932429b808cf
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are identified as malicious redirectors or part of a link farm. The document body and heuristics indicate a lure for game hacks and free in-game currency, a common social engineering tactic. The embedded links likely lead to further malicious content or downloads, suggesting a downloader or redirector functionality.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • 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.
  • 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/coin-master-game-hacks-game-hack In PDF document text
    • http://rafaelmontesinos.com/images/coin-master-free-spins-and-coins-for-iphone_GM406889139.pdfIn PDF document text
    • http://rafaelmontesinos.com/images/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • http://rafaelmontesinos.com/images/can-i-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://rafaelmontesinos.com/images/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • http://rafaelmontesinos.com/images/microsoft-rewards-robux_GM431946152.pdfIn PDF document text
    • http://rafaelmontesinos.com/images/wurst-18-9_GM479516143.pdfIn PDF document text
    • http://rafaelmontesinos.com/images/minecraft-xbox-360-free-download-code_GM479516143.pdfIn PDF document text
    • http://rafaelmontesinos.com/images/how-do-you-get-roblox-money_GM431946152.pdfIn PDF document text
    • http://rafaelmontesinos.com/images/free-robux-pins_GM431946152.pdfIn PDF document text
    • http://rafaelmontesinos.com/images/how-to-download-minecraft-for-free-on-your-phone_GM479516143.pdfIn PDF document text
    • http://rafaelmontesinos.com/images/roblox-gift-card-online-free_GM431946152.pdfIn PDF document text
    • http://rafaelmontesinos.com/images/how-do-you-get-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://rafaelmontesinos.com/images/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
    • http://rafaelmontesinos.com/images/free-roblox-hair-to-wear_GM431946152.pdfIn PDF document text
    • http://rafaelmontesinos.com/images/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • http://rafaelmontesinos.com/images/rape-simulator_GM431946152.pdfIn PDF document text
    • http://rafaelmontesinos.com/images/earn-free-robux_GM431946152.pdfIn PDF document text
    • http://rafaelmontesinos.com/images/free-coins-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://rafaelmontesinos.com/images/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://rafaelmontesinos.com/images/get-free-spins-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_off0000474a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x474A 24320 bytes
SHA-256: 0aec87eff976431407fca18ebe59c3f771b35c62f8975130addde892791aa633
font_01_sfnt_off00007e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E94 17976 bytes
SHA-256: 4c1d26c1fb4feed8092d99a8761960172faa49b0c213e7324f16c91828cd6f14

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