Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbafa16fff253857…

MALICIOUS

PDF

42.6 KB Created: 2021-04-29 04:04:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 1abb356144af32c45089ffb35ae2def0 SHA-1: a1c9c333f1f3d3c2c54da35b091950ecece5817d SHA-256: fbafa16fff2538577f4840ee7fbf9a570057680dbd42b3f2667bf22449a03df9
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1553.005 Security Software Blocking

The PDF document contains multiple links to external websites, likely serving as a lure for users to download malicious content or exploit kits. The heuristic 'SE_SECURITY_BYPASS' indicates the document attempts to instruct the user to disable security software, a common tactic in malicious documents. The ML classifier also flagged this PDF with high confidence, suggesting malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 4

  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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-no-hack-or-download-2021-game-hack
    • https://lib-stie.yai.ac.id/repository/roblox-cheat-codes-for-android.pdf
    • https://lib-stie.yai.ac.id/repository/roblox-mm2-hack-unlimited.pdf
    • https://lib-stie.yai.ac.id/repository/roblox-hack-2021-generator.pdf
    • https://lib-stie.yai.ac.id/repository/roblox-hack-scripts-2021-powerplat.pdf
    • https://lib-stie.yai.ac.id/repository/roblox-hack-mod-menu-download.pdf
    • https://lib-stie.yai.ac.id/repository/roblox-free-clothes-2021.pdf
    • https://lib-stie.yai.ac.id/repository/how-to-become-builders-club-on-roblox-for-free.pdf
    • https://lib-stie.yai.ac.id/repository/hacks-robux-apk.pdf
    • https://lib-stie.yai.ac.id/repository/los-mejores-hacks-nuevo-en-roblox-jailbreak-2021.pdf
    • https://lib-stie.yai.ac.id/repository/roblox-project-pokemon-dll-hack.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004317.bin
6a330764c34bc7a7235e8492ce5b1964663f8caa5c2798e2395d4e0e1fcad6ae		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4317 27036 bytes
font_01_sfnt_off000080eb.bin
f8feec8c376335478e98b70e1a3ff155dd01476790e55f5b43c08e28bc856572		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80EB 19496 bytes

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