Malicious PDF — malware analysis report

Static analysis result for SHA-256 67a4d7e2a7358959…

MALICIOUS

PDF

46.8 KB Created: 2021-06-08 22:42:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 37a4d90e492014a5a5fa793cd3f8962f SHA-1: 2309be2dfb33a94d5d132f1fb7d2b6a05e52c44b SHA-256: 67a4d7e2a7358959e9130dbb8d93bdd3a4cf2d7a2b0e7e53ea05c46ef1bb6eb2
82 Risk Score

Malware Insights

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

The PDF contains an embedded URL and references a lure related to 'Roblox Free Robux Game Hack'. The presence of a 'ML_NYX_PDF_MALICIOUS' heuristic firing and the 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggest the document is designed to trick the user into downloading a password-protected malicious payload. The document body, though heavily obfuscated, contains references to game hacks and URLs pointing to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9748

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.tw/app/431946152/newo-ico-roblox-free-robux-game-hack PDF link annotation
    • http://lib.untad.ac.id/repository/flip-master-free-coins_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/coin-free-spin_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/how-many-levels-does-coin-master-have_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-coin-master-spins-2021-link_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-hack-client_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-make-a-minecraft-java-server-for-free_GM479516143.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-online-hack_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-working-hack_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/logo-hacker-roblox_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-hack-coin-master-ios-no-jailbreak_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/optifine-mcpe_GM479516143.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/offers-for-robux_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/100-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/robux-download_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/wurst-hacks_GM479516143.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/get-free-roblox_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-get-free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000508b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x508B 24844 bytes
SHA-256: 752b4a6dcaf2d486e0440ecc23da070c9d0eeeaeb9fadea0cf6c95b19e0638eb
font_01_sfnt_off00008a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A00 2892 bytes
SHA-256: 2545e3ef0c1e16191691976c2fcc85aeead84f2730c4598ea6f78a3bc04a0e36
font_02_sfnt_off000093f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93F5 18252 bytes
SHA-256: bab1b2e11eb7c5ff82152976734fa10b2970ea3e52643ad562890de76e548d56

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