Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b864734db5b3b5d…

MALICIOUS

PDF

34.2 KB Created: 2021-06-29 04:40:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 868f01c1bc5e43a15d7ef51ac81172a8 SHA-1: f9900894a9d9fd6b969eab86bf2f45f630b1f5fb SHA-256: 3b864734db5b3b5daef9691f13790b47b64897650a34a791fdeabadd3852843c
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links to external resources, many of which are also PDFs, suggesting a link farm designed to distribute malicious content. The document body and embedded links use lures related to popular games like Roblox and Minecraft, aiming to trick users into clicking through to potentially harmful sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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 http://netcdn.co/app/431946152/roblox-bg-brother-cheats-instructions-game-hack
    • http://library.atim.ac.id/repository/roblox-tablet-cheats_GM431946152.pdf
    • http://library.atim.ac.id/repository/roblox-cheat-no-download_GM431946152.pdf
    • http://library.atim.ac.id/repository/free-robux-no-human-verify_GM431946152.pdf
    • http://library.atim.ac.id/repository/how-to-make-free-robux_GM431946152.pdf
    • http://library.atim.ac.id/repository/cheat-codes-in-workout-simulator-in-roblox_GM431946152.pdf
    • http://library.atim.ac.id/repository/how-to-get-minecraft-for-free-on-tablet_GM479516143.pdf
    • http://library.atim.ac.id/repository/how-to-get-free-item-on-roblox-2021-and-2021_GM431946152.pdf
    • http://library.atim.ac.id/repository/how-to-hack-roblox-players-2021_GM431946152.pdf
    • http://library.atim.ac.id/repository/pokemon-go-free-808-pokedex_GM1094591345.pdf
    • http://library.atim.ac.id/repository/roblox-template-download-free_GM431946152.pdf
    • http://library.atim.ac.id/repository/free-minecraft-survival-server_GM479516143.pdf
    • http://library.atim.ac.id/repository/games-to-get-free-robux_GM431946152.pdf
    • http://library.atim.ac.id/repository/how-to-hack-in-roblox-assassin-on-ipad_GM431946152.pdf
    • http://library.atim.ac.id/repository/hack-to-send-gold-cards-on-coin-master_GM406889139.pdf
    • http://library.atim.ac.id/repository/free-robux-advertisment-site_GM431946152.pdf
    • http://library.atim.ac.id/repository/how-to-hack-hole-in-the-wall-roblox_GM431946152.pdf
    • http://library.atim.ac.id/repository/hack-robux-using-goo_GM431946152.pdf
    • http://library.atim.ac.id/repository/how-to-get-the-marshmallow-head-in-roblox-for-free_GM431946152.pdf
    • http://library.atim.ac.id/repository/how-to-get-tix-on-roblox-with-cheat-engine_GM431946152.pdf
    • http://library.atim.ac.id/repository/how-to-download-minecraft-for-free-ios_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002eec.bin
91fcd734910701c38d371ef158abc2704768fd12f47bad5a741f43f5ed5cee40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2EEC 22260 bytes
font_01_sfnt_off00006091.bin
31bb564af1f39c8eed5559358ee6bbafb1837a3f4f97e3fc3a3e2db329c89156		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6091 19016 bytes

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