Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0047b4bfdfdfb68…

MALICIOUS

PDF

36.6 KB Created: 2021-06-28 20:31:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 50fa1bdba3a58b2dcb19abb493808179 SHA-1: 1d558111602b6a95e5c1b15056c80976cd4f30c7 SHA-256: f0047b4bfdfdfb68374709733e3fc2df5c1c347a59cb5cd78417ddd9b8c3cf3b
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 document body that promotes free game-related items, such as 'Robux', to entice users. The presence of a 'Password-protected archive handoff' heuristic suggests the document is designed to trick users into downloading an encrypted payload, which is often a precursor to malware delivery. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/free-roblox-accounts-with-robux-v3rmillion-game-hack PDF link annotation
    • http://library.ulb.ac.id/repository/free-robux-club-com_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-hack-fast_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/cheat-codes-for-candy-treasure-quest-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/robux-free-online_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/doctor-louie-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/wurst-18-9_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/minecraft-114-4-download_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/hack-someones-roblox-password_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/minecraft-creative-mode-free_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/games-like-minecraft-but-free_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-hack-pastebin-2021_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/minecraft-114-4-download-free_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-on-ipad-easy_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-no-verify-human_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-free-spins-hacktman_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-strucid-hacks-pastebin_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-item-game-roblox-twitch_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-dominus-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/feb-23-2021-free-coin-master-spins_GM406889139.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_off000035b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35B4 22424 bytes
SHA-256: a159676040153a4e82f31e7db6a4b9edd2d4923f3c8633e24707b1a48b37467c
font_01_sfnt_off000067d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67D5 19948 bytes
SHA-256: 32fe9c377708ad61161305a2408a9d0ce4f003d03e3851d110986d86525eaa2b

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