Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee85468994eac8d1…

MALICIOUS

PDF

43.2 KB Created: 2021-06-04 03:06:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f9593e3c496225966839f77a7d31a560 SHA-1: 8acea68ecacb2bb1a65b015b70d19398ca2175aa SHA-256: ee85468994eac8d1b5b3a01dd93ca7e677996a7178eb843cba409f0c9df91a0a
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document contains a lure for free in-game currency, directing users to external URLs that are likely malicious. The presence of a 'CMd' token sequence suggests potential command execution, possibly to download and execute a second-stage payload. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.online/app/406889139/free-coins-coin-master-link-game-hack PDF link annotation
    • http://perpus.stfm.ac.id/repository/how-to-get-free-robux-promo-codes_GM431946152.pdfIn macro / runtime command snippet
    • http://www.perpus.stfm.ac.id/repository/coin-master-free-spin-no-offers_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/minecraft-cheats-pc-2021_GM479516143.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/coin-master-pet-food-hack_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/blox-world-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/best-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/free-robux-only-username-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/free-daily-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/free-minecraft-skins-pc_GM479516143.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/free-tiktok-comments_GM835599320.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/free-robux-games_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/minecraft-logo-maker-free_GM479516143.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/minecraft-servers-that-allow-hacks_GM479516143.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_004_off00004e19.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E19 24924 bytes
SHA-256: 20d23a22da902dda34471ee7ea002f2a89315ffb4a8d40e7953628adaa7d84f1
font_01_sfnt_off00008785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8785 17880 bytes
SHA-256: 1662a5b383d9ad60b7b9cee618f90cf0031b74e1c8940e2d562def689eb52552

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