Malicious PDF — malware analysis report

Static analysis result for SHA-256 77aac1d8f44a9d26…

MALICIOUS

PDF

38.5 KB Created: 2021-05-14 13:15:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 0893074a55328e68a021ed94409f9eef SHA-1: e33326c62da5ecb9edd63c025c859e3495c38e94 SHA-256: 77aac1d8f44a9d2653bbafdb7b18a6d6aaadf2e30179f32698bedbaf88272ea4
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for a 'free Robux generator' that redirects to malicious infrastructure. The embedded URL, https://netcdn.xyz/app/431946152/how-to-get-free-robux-no-human-verification-2021-game-hack, is flagged as a malicious redirector. This suggests the document is part of a phishing or scam campaign designed to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

Heuristics 4

  • 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.
  • 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/how-to-get-free-robux-no-human-verification-2021-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
font_00_sfnt_off000036d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x36D2 25464 bytes
SHA-256: 4ad493bc1622d838347bade34cc28c714ed0a6f9ec0cb453497415fdfb9fde97
font_01_sfnt_off000071b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71B3 19428 bytes
SHA-256: dc7c459a90b1a398d2ee51f52972ed8a07904c77cd045887558a99bdb9823e3c