Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd41369755def7e5…

MALICIOUS

PDF

44.2 KB Created: 2021-06-03 22:18:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 456417d5212b78f49efadd7a5b901aa6 SHA-1: ebd006b71936b928d4b9bc79a390a82895edd28e SHA-256: dd41369755def7e5ffbde2a64a43f8746c1ad273af2fa56818eff0b824f1de61
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The sample is a PDF document that displays a fake CAPTCHA or human verification prompt to trick the user into performing an action. It contains an embedded URI pointing to a suspicious URL, which likely hosts a malicious payload. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/431946152/roblox-devil-game-hack PDF link annotation
    • http://library.imz.or.id/repository/coin-master-free-spins-2021-haktuts_GM406889139.pdfIn PDF document text
    • http://library.imz.or.id/repository/get-free-tiktok-likes_GM835599320.pdfIn PDF document text
    • http://library.imz.or.id/repository/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/coin-master-hack-apk-2021_GM406889139.pdfIn PDF document text
    • http://library.imz.or.id/repository/free-robux-human-verification_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://library.imz.or.id/repository/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/minecraft-bedrock-edition-download-pc-free_GM479516143.pdfIn PDF document text
    • http://library.imz.or.id/repository/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/free-minecraft-gift-card_GM479516143.pdfIn PDF document text
    • http://library.imz.or.id/repository/free-dominus-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/free-spins-coin-master-cheat_GM406889139.pdfIn PDF document text
    • http://library.imz.or.id/repository/coin-master-hack-2021-ios-download_GM406889139.pdfIn PDF document text
    • http://library.imz.or.id/repository/hack-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://library.imz.or.id/repository/roblox-top_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/robux-without-verification_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/get-robux-today_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/hack-the-game-coin-master_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
stream_004_off00004ea0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EA0 26444 bytes
SHA-256: 49ac356eee832b0d938910283a3e3d91c68bfa2886759e810008a92695f4459d
font_01_sfnt_off00008a49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A49 18184 bytes
SHA-256: 228d9baa03aba80999033b04d18df637c8a6ae95d309aac9b6611bd5d5156bd2

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