Malicious PDF — malware analysis report

Static analysis result for SHA-256 d175d708009292d2…

MALICIOUS

PDF

33.2 KB Created: 2021-07-19 18:52:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: b2dd930af3d4cbed1ef93b315e17ceae SHA-1: cd8a632558aa656a6aedbfcfb11ac28cae50ab35 SHA-256: d175d708009292d29715f9c66ebf1681f16fe8452e6c12f24dcf0dcdfddf7a6f
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The document presents a fake CAPTCHA or verification prompt to trick the user into clicking a link, which is a common social engineering tactic. The embedded URL `http://netcdn.tw/app/431946152/codes-to-get-free-robux-game-hack` likely leads to a malicious download or scam. Although no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to exploit user interaction for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.tw/app/431946152/codes-to-get-free-robux-game-hack
    • http://srisaket.nfe.go.th/UserFiles/File/free-spins-and-coins-on-coin-master_GM406889139.pdf
    • http://srisaket.nfe.go.th/UserFiles/File/free-robux-codes-2021_GM431946152.pdf
    • http://srisaket.nfe.go.th/UserFiles/File/free-fans-on-tiktok_GM835599320.pdf
    • http://srisaket.nfe.go.th/UserFiles/File/how-do-you-get-minecraft-for-free_GM479516143.pdf
    • http://srisaket.nfe.go.th/UserFiles/File/how-to-get-free-robux-no-scam_GM431946152.pdf
    • http://srisaket.nfe.go.th/UserFiles/File/coin-master-free-spins-2021_GM406889139.pdf
    • http://srisaket.nfe.go.th/UserFiles/File/minecraft-hacks_GM479516143.pdf
    • http://srisaket.nfe.go.th/UserFiles/File/haktuts-coin-master-free-daily-spins_GM406889139.pdf
    • http://srisaket.nfe.go.th/UserFiles/File/free-robux-games-that-actually-work_GM431946152.pdf
    • http://srisaket.nfe.go.th/UserFiles/File/free-tiktok-likes-no-survey_GM835599320.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00002d6e.bin
9917a98833a28e97a3740c651c2d00d34a3fe0ada0e7ed7fb830d93d46dd2523		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2D6E 22356 bytes
font_01_sfnt_off00005f25.bin
d8df780dd9152f792ca5811d4d2bf8cc7bec42c2ad4f1fc57a29b955cb4b066b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F25 18480 bytes

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