Malicious PDF — malware analysis report

Static analysis result for SHA-256 b35f83edc70f3f04…

MALICIOUS

PDF

38.9 KB Created: 2021-06-29 08:23:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 652ab468a774805269daf7b2b8b6a1f8 SHA-1: 13377bf4270720d82f3abb94a9ebe4b95644ca0f SHA-256: b35f83edc70f3f048c3002ccf3204e17246deb92abc34280ff34ec40fa19c012
102 Risk Score

Malware Insights

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

The PDF document contains a significant number of embedded links, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various external domains. One prominent URL is http://netcdn.co/app/431946152/how-to-hack-vehicle-simulator-roblox-game-hack, which appears to be a lure for game-related cheats. The presence of a 'ML_NYX_PDF_MALICIOUS' score of 0.998540 further supports the malicious nature of this document, suggesting it is designed to redirect users to potentially harmful content or facilitate further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 4

  • 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
  • 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 http://netcdn.co/app/431946152/how-to-hack-vehicle-simulator-roblox-game-hack PDF link annotation
    • http://www.nguyentraiedu.vn/cms/public/upload/files/coin-master-daily-free-spins-link-haktuts_GM406889139.pdfIn PDF document text
    • http://www.nguyentraiedu.vn/cms/public/upload/files/jailbreak-roblox-cheats-cage_GM431946152.pdfIn PDF document text
    • http://www.nguyentraiedu.vn/cms/public/upload/files/roblox-free-cards-codes-2021_GM431946152.pdfIn PDF document text
    • http://www.nguyentraiedu.vn/cms/public/upload/files/can-you-get-hacked-by-bots-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.nguyentraiedu.vn/cms/public/upload/files/roblox-for-free-without-signing-in_GM431946152.pdfIn PDF document text
    • http://www.nguyentraiedu.vn/cms/public/upload/files/hacks-for-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://www.nguyentraiedu.vn/cms/public/upload/files/how-to-get-free-robux-fast-on-computer-2021_GM431946152.pdfIn PDF document text
    • http://www.nguyentraiedu.vn/cms/public/upload/files/roblox-hack-robux-cheat-engine-61_GM431946152.pdfIn PDF document text
    • http://www.nguyentraiedu.vn/cms/public/upload/files/coin-master-hacks-for-android_GM406889139.pdfIn PDF document text
    • http://www.nguyentraiedu.vn/cms/public/upload/files/no-promises-cheat-codes-roblox-id_GM431946152.pdfIn PDF document text
    • http://www.nguyentraiedu.vn/cms/public/upload/files/how-to-get-free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://www.nguyentraiedu.vn/cms/public/upload/files/does-roblox-have-a-built-in-anti-exploit-anti-cheat_GM431946152.pdfIn PDF document text
    • http://www.nguyentraiedu.vn/cms/public/upload/files/free-uno-card-roblox-skin_GM431946152.pdfIn PDF document text
    • http://www.nguyentraiedu.vn/cms/public/upload/files/is-roblox-getting-hacked-right-now_GM431946152.pdfIn PDF document text
    • http://www.nguyentraiedu.vn/cms/public/upload/files/arcane-adventures-hack-roblox-levels_GM431946152.pdfIn PDF document text
    • http://www.nguyentraiedu.vn/cms/public/upload/files/how-to-get-free-robux-ultimate-gamer-365_GM431946152.pdfIn PDF document text
    • http://www.nguyentraiedu.vn/cms/public/upload/files/how-to-hack-robux-javascript-pastebin_GM431946152.pdfIn PDF document text
    • http://www.nguyentraiedu.vn/cms/public/upload/files/stickmasterluke-free-robux-game-link_GM431946152.pdfIn PDF document text
    • http://www.nguyentraiedu.vn/cms/public/upload/files/can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.nguyentraiedu.vn/cms/public/upload/files/unlimited-robux-hack-2021_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
font_00_sfnt_off00003e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3E1E 22848 bytes
SHA-256: 24bab006dbdc9e3d776add63353287aca1bf2f11cc4753b66de9e960cc7cf7e9
font_01_sfnt_off00007152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7152 19744 bytes
SHA-256: b8f9d6fd9e3aaf3153c8a9ec7ed047a9c131e97ca7a43af3213d1da42eceabfc

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