Malicious PDF — malware analysis report

Static analysis result for SHA-256 8389003b17c381a7…

MALICIOUS

PDF

44.6 KB Created: 2021-05-16 05:14:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 202f806699d79435ce8a57751bf45aeb SHA-1: 69d085d15856a0ad68bd491bb9b094c5b4d9d506 SHA-256: 8389003b17c381a705885c698788c45f754a2984b0395c7f307fb10518735924
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links to external websites, many of which are structured as SEO link farms for game-related cheats and currency. The document body and extracted URLs suggest a lure for free in-game items, likely leading to malicious sites or further downloads. The ML classifier strongly indicated maliciousness, and the PDF structure itself is indicative of a link farm designed to attract traffic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.xyz/app/431946152/how-to-get-free-robux-without-paying-game-hack
    • http://cleananddecluttered.com/images/free-robux-codes-2021_GM431946152.pdf
    • http://cleananddecluttered.com/images/coin-master-free_GM406889139.pdf
    • http://cleananddecluttered.com/images/coin-master-free-2021-spin-link_GM406889139.pdf
    • http://cleananddecluttered.com/images/coin-master-free-spins-2021-hack_GM406889139.pdf
    • http://cleananddecluttered.com/images/coin-master-free-daily-spins-and-coins_GM406889139.pdf
    • http://cleananddecluttered.com/images/coin-master-hacks-for-android_GM406889139.pdf
    • http://cleananddecluttered.com/images/free-robux-games-on-roblox_GM431946152.pdf
    • http://cleananddecluttered.com/images/how-to-get-free-items-on-roblox_GM431946152.pdf
    • http://cleananddecluttered.com/images/free-robux-generator-for-kids_GM431946152.pdf
    • http://cleananddecluttered.com/images/i-want-free-robux_GM431946152.pdf
    • http://cleananddecluttered.com/images/roblox-script-executor-free_GM431946152.pdf
    • http://cleananddecluttered.com/images/minecraft-bedrock-edition-pc-free_GM479516143.pdf
    • http://cleananddecluttered.com/images/free-robux-websites-that-actually-work_GM431946152.pdf
    • http://cleananddecluttered.com/images/coin-master-hack-mod-apk-free-download_GM406889139.pdf
    • http://cleananddecluttered.com/images/how-to-get-free-robux-com_GM431946152.pdf
    • http://cleananddecluttered.com/images/coin-master-free-spins-hack_GM406889139.pdf
    • http://cleananddecluttered.com/images/roblox-troll-outfits-free_GM431946152.pdf
    • http://cleananddecluttered.com/images/getrobux-now_GM431946152.pdf
    • http://cleananddecluttered.com/images/coin-master-daily-free-spins-and-coins_GM406889139.pdf
    • http://cleananddecluttered.com/images/coin-master-hack-android_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a87.bin
20d34e28eea97094dcf4d5255038376ba47dfef4b6b38593632687271f3b94fc		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A87 26744 bytes
font_01_sfnt_off00008815.bin
cf429e2e91354d73b6f0728fc312d6ff4bad20be80a5ba6db32adcb01c969c4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8815 19616 bytes

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