Malicious PDF — malware analysis report

Static analysis result for SHA-256 10fcd4a393ffe6a3…

MALICIOUS

PDF

45.5 KB Created: 2021-06-11 09:06:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 1fbbfcbd67b96b39185103dee31bd061 SHA-1: 51474408a6d35438061fcba6994d36f874128772 SHA-256: 10fcd4a393ffe6a38b2b925b13e88887b07ebcac3f9f49401b18aa5dd4e65bbe
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links to external PDF files, many of which appear to be related to game hacks and cheats. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of these links, suggesting a deliberate attempt to direct users to potentially malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern. While no scripts were explicitly extracted, the nature of the links and the ML classification strongly suggest a malicious intent to trick users into downloading harmful files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.tw/app/431946152/a-file-with-hacked-games-roblox-game-hack
    • http://www.duchem.ae/uploaded_files/userfiles/files/royalty-free-music-one-roblox_GM431946152.pdf
    • http://www.duchem.ae/uploaded_files/userfiles/files/coin-master-hack-app-download-free_GM406889139.pdf
    • http://www.duchem.ae/uploaded_files/userfiles/files/coin-master-daily-free-spins-hack_GM406889139.pdf
    • http://www.duchem.ae/uploaded_files/userfiles/files/coin-master-free-spins-and-coins-2021_GM406889139.pdf
    • http://www.duchem.ae/uploaded_files/userfiles/files/coin-hackhub-coin-master_GM406889139.pdf
    • http://www.duchem.ae/uploaded_files/userfiles/files/free-robux-sites-that-work_GM431946152.pdf
    • http://www.duchem.ae/uploaded_files/userfiles/files/how-to-play-minecraft-online-for-free_GM479516143.pdf
    • http://www.duchem.ae/uploaded_files/userfiles/files/coin-master-free-spin-and-coins-links-home_GM406889139.pdf
    • http://www.duchem.ae/uploaded_files/userfiles/files/farm-life-roblox-cheat_GM431946152.pdf
    • http://www.duchem.ae/uploaded_files/userfiles/files/coin-master-generator-hack_GM406889139.pdf
    • http://www.duchem.ae/uploaded_files/userfiles/files/coin-master-haktuts_GM406889139.pdf
    • http://www.duchem.ae/uploaded_files/userfiles/files/free-robux-generator-2021_GM431946152.pdf
    • http://www.duchem.ae/uploaded_files/userfiles/files/how-to-get-roblox-premium-for-free-2021_GM431946152.pdf
    • http://www.duchem.ae/uploaded_files/userfiles/files/tiktok-followers-for-free_GM835599320.pdf
    • http://www.duchem.ae/uploaded_files/userfiles/files/free-pants-in-roblox_GM431946152.pdf
    • http://www.duchem.ae/uploaded_files/userfiles/files/free-robux-that-actually-works_GM431946152.pdf
    • http://www.duchem.ae/uploaded_files/userfiles/files/roblox-hack-download_GM431946152.pdf
    • http://www.duchem.ae/uploaded_files/userfiles/files/minecraft-free-apk_GM479516143.pdf
    • http://www.duchem.ae/uploaded_files/userfiles/files/daily-free-spins-coin-master-2021_GM406889139.pdf
    • http://www.duchem.ae/uploaded_files/userfiles/files/free-robux-with-no-survey_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051a8.bin
d308a023460fed42ea53251ca154b8b86105c845c2cf47c4a3e66567b9d2f05c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51A8 25312 bytes
font_01_sfnt_off00008c5a.bin
f3574283e7826e54c7fd563f4ea56fb573e4f57131b2a07702d1a397b1a9f1a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C5A 19368 bytes

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