Malicious PDF — malware analysis report

Static analysis result for SHA-256 75bfceddb6002cfb…

MALICIOUS

PDF

35.8 KB Created: 2021-06-27 06:15:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4313e8c4be330dc09bc9a0f00e88297f SHA-1: ee4cf3de7d6cf686c6e58129d89374ee19feaad3 SHA-256: 75bfceddb6002cfb34a74af3924f73701a2f0bcac68c10b872c335e3f37a4381
82 Risk Score

Malware Insights

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

This PDF document exhibits malicious behavior by presenting a fake CAPTCHA or verification prompt to trick users into downloading further content. The document body and extracted URLs heavily feature lures for game hacks and in-game currency, such as Robux. The presence of external URIs and the ML classifier's high confidence score indicate a high likelihood of malicious intent, likely involving the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/robux-hack-no-verification-or-survey-2021-game-hack PDF link annotation
    • http://perpus.polimarim.online/repository/free-t-shirt-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/how-to-hack-roblox-game-2021_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/coin-master-free-spins-ios_GM406889139.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/roblox-one-piece-treasure-hack_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/robux-xyz_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/how-to-hack-a-minecraft-server_GM479516143.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/wurst-minecraft_GM479516143.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/nuevo-hack-de-robux-2021_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/how-to-get-free-robux-in-roblox-inspect_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/coin-master-game-hack-app_GM406889139.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/how-to-hack-anyone-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/free-i-robux_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/how-to-get-robux-on-rbx-free_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/how-can-i-get-free-robux-in-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/counter-blox-roblox-offensive-case-hack_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/free-roblox-giver-roblox_GM431946152.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_off000030ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30CA 23536 bytes
SHA-256: 714b15a7df787dc657b51eb2de65f93d2bd6c36ceccc7bf94c25962a8eb72a29
font_01_sfnt_off0000649b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x649B 19776 bytes
SHA-256: 2cb1211f6cae3be6c636582e9a40dfb8bb66df599620c49c308a474d9a86a801

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