Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcfbcef87923b9ce…

MALICIOUS

PDF

39.4 KB Created: 2021-05-15 13:37:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: c26f6513ed3e1af15cbb80a75378d77b SHA-1: 252e563dd7e927bfb5903203d0caaacb8f811a06 SHA-256: bcfbcef87923b9cee44abe1a68be50b37de75c578c6236ec0f143f212f33569f
170 Risk Score

Malware Insights

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

The PDF document employs a lure related to 'free Robux' and 'game hacks', presenting a fake CAPTCHA to trick the user into interacting with a malicious redirector URL. This URL, https://netcdn.xyz/app/431946152/free-robux-without-verification-or-survey-game-hack, is identified as a malicious redirector, suggesting the document's primary purpose is to lead the user to a site that likely hosts or facilitates the download of additional malicious content.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • 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/free-robux-without-verification-or-survey-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_off00003369.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3369 29920 bytes
SHA-256: 9511fdc84a7f4a9eb132a21f153990c32c54abb5cd099b07e61b5be3cce15767
font_01_sfnt_off0000761b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x761B 19256 bytes
SHA-256: e141b644a4ecfde99000ea6fb335fe57c508717aca49a84e1609c2cc829300c4

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