Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8adfcbaa6f3ccab…

MALICIOUS

PDF

42.3 KB Created: 2021-05-17 21:23:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: be30e45784229e963e9f2fa4442f237b SHA-1: 0d348cc661341d189f11753d2f7cb055b1244bf4 SHA-256: d8adfcbaa6f3ccab86395878c497c6c0a1d893a6c6f8a9ea673abaa75b435edc
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector infrastructure, specifically promoting "game hacks" and "free spins" for popular games like Coin Master and Roblox. The primary redirector URL is https://netcdn.xyz/app/406889139/coin-master-gold-cards-free-link-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a social engineering lure designed to drive users to malicious sites, likely for further payload delivery or credential harvesting.

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/coin-master-gold-cards-free-link-game-hack In PDF document text
    • http://www.riverkennet.org/uploads/files/files/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/coin-master-free-spins-link-download-apk_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/minecraft-wurst-client_GM479516143.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/roblox-avatar-free_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/coin-master-hack-tool-without-verification_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/how-to-give-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/how-long-is-the-minecraft-free-trial_GM479516143.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/coin-drop-master-free_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/coin-master-daily-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/how-to-get-minecraft-bedrock-edition-for-free_GM479516143.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/how-to-hack-coin-master-apple_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/download-hacked-games-coin-master_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/roblox-its-free_GM431946152.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_off00004b84.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B84 24360 bytes
SHA-256: 2741826f0207dc4620de0b50355bb0177f63d1cc20afc29ace687d9feff17ad4
font_01_sfnt_off0000837e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x837E 18128 bytes
SHA-256: 3c7d889e052bb081026c5a88f6ee2afe5bc892e32bf973502febc93f4313d009

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