Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6655b1094bfaa46…

MALICIOUS

PDF

38.4 KB Created: 2021-05-12 16:53:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: add395710c774fffcb0f3fa87bda3bf6 SHA-1: 03afcf88b69801cc97189271cae66a3bbc3e6053 SHA-256: c6655b1094bfaa4699b06934302d2118b9f5d9ea3ddd307f29e34a7ef65d42d3
110 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a heuristic firing for a malicious redirector link pointing to 'https://netcdn.xyz/app/431946152/robuxlove-.net-free-robux-game-hack'. Additionally, a fake CAPTCHA heuristic indicates a social engineering tactic to trick the user into interacting with the document. The document body also contains references to 'Robuxlove .net Free Robux' and a generator, suggesting a scam or phishing lure.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/robuxlove-.net-free-robux-game-hack In 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
stream_003_off000036dd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x36DD 26976 bytes
SHA-256: 42764857d95de24e16a4e7af91dd1d09f224aa259f3f169d95a1cc4c9d64ea3b
font_01_sfnt_off000074a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74A1 18372 bytes
SHA-256: 65db4e182113fd1a8aa6d8046ef53f92d54fa7b6a505b130f920b75136a01eb1

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