Malicious PDF — malware analysis report

Static analysis result for SHA-256 90cad23a6be5cfe6…

MALICIOUS

PDF

43.1 KB Created: 2021-05-17 16:00:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 22e4b813ce0745e8eb666d5820704925 SHA-1: cddb387dfcfcfd6b4a3eb7c7c0b761f724790b61 SHA-256: 90cad23a6be5cfe6e8cc95d964a66939f07bc56bcb2d854311ad9f0db2680787
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links and explicit calls to action, such as 'Free Robux Without Human Verification 2021' and 'CLICK HERE TO ACCESS ROBLOX GENERATOR', directing users to a known malicious redirector. This indicates a social engineering lure designed to trick users into visiting potentially harmful websites. While no scripts were directly extracted, the PDF structure and embedded links strongly suggest an attempt to lead the user to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier clean score 0.0344

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/free-robux-without-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
stream_003_off000032ee.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32EE 37276 bytes
SHA-256: 940b2153dfc3851764d4227867fea87d1cb62f62247a9a792b06ca2d2648d263
font_01_sfnt_off0000839b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x839B 19624 bytes
SHA-256: 5c907f8fc0171ac382cbe47737dfe307495a07ea2f2097b2a41ed37680731fb3

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