Malicious PDF — malware analysis report

Static analysis result for SHA-256 d665b87a49fe958e…

MALICIOUS

PDF

42.5 KB Created: 2021-04-27 05:29:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 86f24b5bf48695ac0c9afce76cd0bbe6 SHA-1: 5d8d7e2c9d1bd3f3d45ed569b04a0d5faa8f28a9 SHA-256: d665b87a49fe958ebc6307f1fa23e6d9a946294ef48ed4aa4f46ed18f74ae868
82 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs and a prominent external URI pointing to a site offering free Robux, a common lure for credential harvesting or malware distribution. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be part of a multi-stage attack, potentially requiring a password to decrypt a payload. The ML classifier strongly indicates maliciousness.

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-obby-gives-you-free-robux-july-no-password-2021-game-hack PDF link annotation
    • http://vetmed.fkh.unair.ac.id/repository/fashion-frenzy-roblox-free.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/how-do-i-report-a-hacked-account-on-roblox.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/dungeon-quest-cheat-engine-roblox.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/does-e-free-work-roblox.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/free-robux-generator-computer.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/game-robux-free.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/free-robux-in-game-tyoe-your-password.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/roblox-money-hack-2021.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/hack-shrek-roblox.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/71-free-robux.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
font_00_sfnt_off0000423e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x423E 27364 bytes
SHA-256: 2fd547d31172884f3356215f66d1683d4013baff15c25aacbde1d6a8d87e2995
font_01_sfnt_off00007f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F6B 19952 bytes
SHA-256: dcdc57d277cf9db69763160ca4077f1ac843a762dc77e834f60444dc79234acb

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