Malicious PDF — malware analysis report

Static analysis result for SHA-256 d36f1a6465fceacb…

MALICIOUS

PDF

38.3 KB Created: 2021-05-21 11:26:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: e4031c14db1baee84c887113b58ae5b6 SHA-1: a8b483becec6ff8e5dc23c431de46942c32c4cc1 SHA-256: d36f1a6465fceacb97853899c814690200e26b247c8de704fc7a8f10eae6ef54
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA or human verification prompt, a common lure to trick users into clicking malicious links. The embedded URL and other extracted URLs point to sites offering 'free followers', 'free spins', or 'free Robux', further indicating a social engineering attempt. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9407

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/how-to-get-free-followers-and-likes-on-tiktok-game-hack
    • http://junktiquecollector.com/images/wwwcoin-master-free-spincom_GM406889139.pdf
    • http://junktiquecollector.com/images/free-roblox-outfits_GM431946152.pdf
    • http://junktiquecollector.com/images/free-robux-generator-2021-no-survey_GM431946152.pdf
    • http://junktiquecollector.com/images/coin-master-spin-hack-trick_GM406889139.pdf
    • http://junktiquecollector.com/images/free-modded-minecraft-server_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000032ac.bin
154e4e6502f297ac1c2794656783978548ac30c132d717fd9946230cac2eaa0a		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32AC 29920 bytes
font_01_sfnt_off000075ff.bin
87da797106309c57a019667c55c9ef8c35737ef30261d1d9189b3e6d30f9577d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75FF 17868 bytes

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