Malicious PDF — malware analysis report

Static analysis result for SHA-256 344cdeaf8fa6644d…

MALICIOUS

PDF

38.9 KB Created: 2021-05-10 17:21:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c722eadefd230d51c05025429fffe14c SHA-1: 06290746b76c0aba02866eb265cb29121642e075 SHA-256: 344cdeaf8fa6644d1076ea9e61d4c5b13d6e142cc57a98c18fea2fd09709b41d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to known malicious infrastructure, specifically promoting "game hacks" and "free generators" for popular games. The primary lure URL is https://netcdn.xyz/app/406889139/coin-master-gift-link-game-hack, which is associated with a known malicious redirector. The document body, though partially corrupted, contains references to this URL and appears to be a lure for a "Coin Master" hack. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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/coin-master-gift-link-game-hack In PDF document text
    • http://armatrutz.de/images/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://armatrutz.de/images/aternos-free-minecraft-server_GM479516143.pdfIn PDF document text
    • http://armatrutz.de/images/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://armatrutz.de/images/coin-master-free-spins-hack-download_GM406889139.pdfIn PDF document text
    • http://armatrutz.de/images/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://armatrutz.de/images/free-draw-roblox_GM431946152.pdfIn PDF document text
    • http://armatrutz.de/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://armatrutz.de/images/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://armatrutz.de/images/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://armatrutz.de/images/hacked-roblox-game_GM431946152.pdfIn PDF document text
    • http://armatrutz.de/images/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://armatrutz.de/images/download-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • http://armatrutz.de/images/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://armatrutz.de/images/coin-master-app-for-free-spins_GM406889139.pdfIn PDF document text
    • http://armatrutz.de/images/coin-master-free-spin-link-list_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_off00003fc8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3FC8 24248 bytes
SHA-256: 4924d904a12ab2226420459a162d8647be48dbe66dcbf6871017094c9874c7ad
font_01_sfnt_off0000773b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x773B 17716 bytes
SHA-256: 8f803537a119e07ded82a73af47a81e82657788fe52602d20bb0bf58e866784a

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