Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bf83a6ae5bbcbc0…

MALICIOUS

PDF

39.6 KB Created: 2021-05-22 16:39:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 65e9ef5d830ce5e3417a61bc5b88305a SHA-1: b9d18062cda079e1f20b41937e66fe89882abbb9 SHA-256: 3bf83a6ae5bbcbc033c22a26f2f76553d3ee4e1b66d4ac271f9c59132b245824
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 users into interacting with a malicious link. The embedded URL and multiple other URLs point to sites offering free items or hacks, further supporting a social engineering pretext. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8060

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/835599320/free-tiktok-likes-no-human-verification-or-downloading-apps-game-hack PDF link annotation
    • http://www.ck-ceramic.com/Public/upload/editorfiles/how-to-get-minecraft-for-free-on-ps4_GM479516143.pdfIn PDF document text
    • http://www.ck-ceramic.com/Public/upload/editorfiles/my-robux_GM431946152.pdfIn PDF document text
    • http://www.ck-ceramic.com/Public/upload/editorfiles/earn-free-robux-today_GM431946152.pdfIn PDF document text
    • http://www.ck-ceramic.com/Public/upload/editorfiles/roblox-gift-card-for-free_GM431946152.pdfIn PDF document text
    • http://www.ck-ceramic.com/Public/upload/editorfiles/hacks-para-roblox_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_002_off00003384.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3384 24328 bytes
SHA-256: 221c516a012566b53af1d6bf1e2e2cb16237026abb37e9c15365c8237d66de40
font_01_sfnt_off00006b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B3F 3188 bytes
SHA-256: 4da812de1655131f9c055ccb60d56d4600378c7785193955b5e3de06fceb3951
font_02_sfnt_off00007637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7637 19260 bytes
SHA-256: 26817b4cedfa85687dbcd5cd5fe0b6768af480ef1d18351329c732120202e544

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