Malicious PDF — malware analysis report

Static analysis result for SHA-256 5315a9ec1520f8a8…

MALICIOUS

PDF

34.4 KB Created: 2021-07-06 01:29:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 3877a08f3a4dba8773e8f4b03bd10df9 SHA-1: dd9b0c8fe7213ee3aa27f24501c79dcae165961c SHA-256: 5315a9ec1520f8a8ae0b128b99303bf63040b01fb5a541927f834476a893dae1
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external resources, disguised as free game-related content such as Minecraft server hosting and Roblox hacks. The presence of an external URI and the ML classifier's high confidence score indicate malicious intent, likely to trick users into downloading malware. No scripts were extracted, but the document body and embedded URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.tw/app/479516143/minecraft-bedrock-server-hosting-free-game-hack
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/2021-roblox-hack_GM431946152.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/100-free-spins-coin-master_GM406889139.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/black-curls-hair-extension-roblox-free_GM431946152.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/cheat-roblox-mad-paintball-2_GM431946152.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/installer-script-roblox-hack-gui_GM431946152.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/how-to-make-your-own-minecraft-server-for-free_GM479516143.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/robux-unlimited-hack_GM431946152.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/roblox-games-that-give-you-free-robux_GM431946152.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/coin-master-free-cards_GM406889139.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/nonhacking-and-or-inspecting-for-robux_GM431946152.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/hacks-para-tener-robux-2021_GM431946152.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/master-coin-free-link_GM406889139.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/how-to-get-girl-hair-on-roblox-for-free-2021_GM431946152.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/wurst-112-2_GM479516143.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/free-robux-generator-no-verification-2021_GM431946152.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/how-can-i-get-free-spins-on-coin-master_GM406889139.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/coin-master-hack-2021-android_GM406889139.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/roblox-robux-generator-http-freerobuxgenerator-xyz_GM431946152.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/scaffold-minecraft-hack_GM479516143.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/free-minecraft-hacks_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000030ed.bin
2d9c13ea14bde051ab33168b50bad9d6e3cc09435f9bf4838e68748a8db5a782		 pdf-font-stream PDF embedded font (sfnt) at offset 0x30ED 22404 bytes
font_01_sfnt_off000062a2.bin
c45ccb7756ad31f0eb1659f3c43916dbd490baa96d6c6b1730beaec095da97be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62A2 18672 bytes

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