Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6eac6e50faf4ba2…

MALICIOUS

PDF

34.4 KB Created: 2021-07-06 02:49:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f3d71f34e28f911d74250f70cb4fa061 SHA-1: 49e6b9ec6fa6dfbb012c0cf79d3966448ed256c4 SHA-256: b6eac6e50faf4ba278e766edc28b17f7bb4149013a65863549b1f2299dcc3e54
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free game hacks and Robux, directing users to a known malicious redirector. The embedded URLs and document body content strongly suggest a social engineering tactic to trick users into visiting potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious redirector chain, likely leading to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/free-robux-not-a-scam-game-hack In PDF document text
    • http://www.riverkennet.org/uploads/files/files/case-clicker-hack-roblox-script_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/free-robux-script_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/coin-master-free-spins-2-5-2021_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/how-to-get-free-shirts-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/roblox-speed-hack-lua-script_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/how-to-start-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/free-code-for-roblox-december-2021-unicorn_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/tiktok-free-fire_GM835599320.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/free-robux-rewards-discord_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/how-to-get-minecraft-for-free-on-laptop_GM479516143.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/what-is-the-money-cheat-for-roblox_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/best-free-roblox-game_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/free-tiktok-views-no-verification_GM835599320.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/open-coin-master_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/roblox-free-dragon-ball-z-games_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/coin-master-35-16-hack-apk_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
font_00_sfnt_off000030af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30AF 21932 bytes
SHA-256: 8d7d9ea061e31d58d6dfaea5e946e5ab0d0d003249fa5d4e083f143ca3a58096
font_01_sfnt_off00006141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6141 19080 bytes
SHA-256: 14e01471e6a07db1a68c511ee00ed8ed146bd69de2dd1952b6465b95f794ce32

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