Malicious PDF — malware analysis report

Static analysis result for SHA-256 4137399fd99e82ff…

MALICIOUS

PDF

44.4 KB Created: 2021-06-03 06:41:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: d85cf08bf9620420c77105c8dff2e850 SHA-1: 68507f6e677a45cebc3aef76063e20667c8203bc SHA-256: 4137399fd99e82ff32601fb43d9b9f760d1a88096afdeec30e8bf43303968ecc
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to websites offering game cheats or free in-game currency, suggesting a lure for users interested in such topics. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of numerous embedded URLs and the heuristic firing for a 'PDF_SEO_LINK_FARM' indicate a likely attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/431946152/roblox-fun-com-free-robux-game-hack
    • http://jpschoolnewdelhi.com/uploaded_files/userfiles/files/is-roblox-free-on-pc_GM431946152.pdf
    • http://jpschoolnewdelhi.com/uploaded_files/userfiles/files/free-spins-coin-master-cheat_GM406889139.pdf
    • http://jpschoolnewdelhi.com/uploaded_files/userfiles/files/wurst-download_GM479516143.pdf
    • http://jpschoolnewdelhi.com/uploaded_files/userfiles/files/coin-master-free-link-spin_GM406889139.pdf
    • http://jpschoolnewdelhi.com/uploaded_files/userfiles/files/how-can-i-get-free-robux_GM431946152.pdf
    • http://jpschoolnewdelhi.com/uploaded_files/userfiles/files/roblox-dinosaur-simulator-cheat-engine-dna_GM431946152.pdf
    • http://jpschoolnewdelhi.com/uploaded_files/userfiles/files/easy-robux-today-com_GM431946152.pdf
    • http://jpschoolnewdelhi.com/uploaded_files/userfiles/files/lucky-patcher-coin-master-hack_GM406889139.pdf
    • http://jpschoolnewdelhi.com/uploaded_files/userfiles/files/free-mods-for-minecraft-pe_GM479516143.pdf
    • http://jpschoolnewdelhi.com/uploaded_files/userfiles/files/how-do-u-get-free-robux-2021_GM431946152.pdf
    • http://jpschoolnewdelhi.com/uploaded_files/userfiles/files/coin-master-hack-2021-app-download_GM406889139.pdf
    • http://jpschoolnewdelhi.com/uploaded_files/userfiles/files/lastrick-com-coin-master-hack_GM406889139.pdf
    • http://jpschoolnewdelhi.com/uploaded_files/userfiles/files/apps-that-give-you-free-robux_GM431946152.pdf
    • http://jpschoolnewdelhi.com/uploaded_files/userfiles/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdf
    • http://jpschoolnewdelhi.com/uploaded_files/userfiles/files/coin-master-free-spin-links-december-30-2021_GM406889139.pdf
    • http://jpschoolnewdelhi.com/uploaded_files/userfiles/files/robux-no-human-verification-2021_GM431946152.pdf
    • http://jpschoolnewdelhi.com/uploaded_files/userfiles/files/roblox-free-robux-generator_GM431946152.pdf
    • http://jpschoolnewdelhi.com/uploaded_files/userfiles/files/coin-master-hack-unlimited-spins-and-coins-cheats_GM406889139.pdf
    • http://jpschoolnewdelhi.com/uploaded_files/userfiles/files/robux-gift-card-free_GM431946152.pdf
    • http://jpschoolnewdelhi.com/uploaded_files/userfiles/files/earn-free-robux-for-roblox_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005200.bin
61b640b8df7988538c0212b25b7190dec08e84e5938aa74588e34df412d26cab		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5200 24768 bytes
font_01_sfnt_off00008ad0.bin
9560f0e6f9a4e6be006083e3696e79311a38bb173f302534750988b281bae61f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AD0 18348 bytes

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