Malicious PDF — malware analysis report

Static analysis result for SHA-256 d86de2ff36a0e7c5…

MALICIOUS

PDF

42.7 KB Created: 2021-04-27 14:09:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a8cda40419a08c017605a7447b612b22 SHA-1: 9529f11bb04f57061964d6bf8e38387e496fa712 SHA-256: d86de2ff36a0e7c58737a5ac0f5dad60fbbd3f0d3a3253ab9f16f84945d0688f
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs and a call-to-action phrase, strongly suggesting a lure to download a malicious payload. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document may be instructing the user to decrypt a subsequent stage, further supporting a malicious intent. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 4

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/roblox-how-to-get-free-items-in-catalog-2021-game-hack PDF link annotation
    • http://www.saburai.ac.id/elibrary//repository/how-to-play-a-game-that-cost-robux-free.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/how-to-cheat-on-you-roblox-girlfriend.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/roblox-obby-gives-you-free-robux-july-no-password-2021.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/hacks-to-get-free-robux-2021.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/roblox-jailbreak-speed-hack-update-codes-2021-yasser-gamingyt.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/roblox-dungeon-quest-hack-download.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/free-stuff-in-roblox-catalog-2021.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/robux-hack-without-verification-or-survey.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/how-to-get-free-robux-legit-with-proof.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/free-robux-promo-codes-september-2021.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000463b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x463B 26808 bytes
SHA-256: d62ef398c9f9dd7eee14ce4ff092da1ddf0636c3cfae56d78b690e807106ed52
font_01_sfnt_off000081f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81F0 19392 bytes
SHA-256: 64b9432c12cd231051ae204a55c77ce79b1223ccf48ad2835c80c6050a213876

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