Malicious PDF — malware analysis report

Static analysis result for SHA-256 57a73fe0a28cd76e…

MALICIOUS

PDF

36.1 KB Created: 2021-05-23 09:03:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: c920b4602a7e86ff6688f01fdfd00f50 SHA-1: e76bd915f95fce76502e92a1ca248c7e5662dee8 SHA-256: 57a73fe0a28cd76e1216b0c0c5bb70f156168f5ab9f2fc9cd707059a4dd129eb
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA and a call-to-action to trick the user into clicking a link, which is a common social engineering tactic. The embedded URL points to a resource that appears to be a 'robux hack generator', suggesting a lure for potentially unwanted software or further malicious content. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9492

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/robux-hack-generator-game-hack
    • http://uctovnictvosnv.sk/images/coin-master-free-link_GM406889139.pdf
    • http://uctovnictvosnv.sk/images/free-robux-without-human-verification-2021_GM431946152.pdf
    • http://uctovnictvosnv.sk/images/coin-master-hack-tool-generator_GM406889139.pdf
    • http://uctovnictvosnv.sk/images/mcpe-download_GM479516143.pdf
    • http://uctovnictvosnv.sk/images/how-to-get-free-coins-on-coin-master-hack_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000032b7.bin
836806760ed167683384ea4164a75c4683a625aa754f8c0c8e1b79b31b6a9afb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x32B7 24664 bytes
font_01_sfnt_off00006b36.bin
f5433ce3dc9930d213a8e7315569ee207b9df6dd56817c97a1fb358bc14a6a3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B36 18352 bytes

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