Malicious PDF — malware analysis report

Static analysis result for SHA-256 446d36039a99c2d7…

MALICIOUS

PDF

43.0 KB Created: 2021-05-19 02:08:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: f5c65d88e1ddffa273b9a5bf70b728dc SHA-1: 737bcc3c23ddba3a4f47d2ee3f2a7d6bceaf8d83 SHA-256: 446d36039a99c2d7dd7f96339c40c8d35359abe2c4d85c04b5a5228775dd37c2
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, designed to trick the user into interacting with a malicious link. The embedded URL and numerous other URLs point to domains hosting generators for popular games, suggesting a scam or malware distribution lure. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/431946152/free-roblox-generator-for-roblox-game-hack
    • http://atmos-service.com/images/free-diamonds-coin-master_GM406889139.pdf
    • http://atmos-service.com/images/free-robux-com-roblox_GM431946152.pdf
    • http://atmos-service.com/images/how-to-get-free-things-on-roblox_GM431946152.pdf
    • http://atmos-service.com/images/coin-master-free-spins-2021-today_GM406889139.pdf
    • http://atmos-service.com/images/how-to-get-free-robux-easy_GM431946152.pdf
    • http://atmos-service.com/images/static-moonactive-net_GM406889139.pdf
    • http://atmos-service.com/images/free-spin-coin-master-apk_GM406889139.pdf
    • http://atmos-service.com/images/free-minecraft-gift-codes_GM479516143.pdf
    • http://atmos-service.com/images/coin-master-el-tiger-card-free_GM406889139.pdf
    • http://atmos-service.com/images/free-minecraft-java-edition-codes_GM479516143.pdf
    • http://atmos-service.com/images/daily-coin-master-free-spins_GM406889139.pdf
    • http://atmos-service.com/images/minecraft-windows-10-free-code_GM479516143.pdf
    • http://atmos-service.com/images/coin-master-free-spins-daily-link-game-mod_GM406889139.pdf
    • http://atmos-service.com/images/roblox-assassin_GM431946152.pdf
    • http://atmos-service.com/images/rbx-claim_GM431946152.pdf
    • http://atmos-service.com/images/coin-master-spin-pattern_GM406889139.pdf
    • http://atmos-service.com/images/free-spins-from-coin-master_GM406889139.pdf
    • http://atmos-service.com/images/link-for-free-spins-on-coin-master_GM406889139.pdf
    • http://atmos-service.com/images/archery-master-3d-unlimited-coins-hack_GM406889139.pdf
    • http://atmos-service.com/images/how-to-get-minecraft-for-free-on-phone_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000047c4.bin
f86fa08b485651129d0e0d009d217a205b55d24de724c5bb8d568683c14a86bd		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47C4 27040 bytes
font_01_sfnt_off0000857c.bin
a933d21998376b1e1789d4c480c6983ef3f135197d1bc74c37b8b8f8713ff5e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x857C 18280 bytes

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