Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fdba98121584006…

MALICIOUS

PDF

38.4 KB Created: 2021-05-30 01:03:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 37272440ad054eb9918a7f5c2e405454 SHA-1: 25ec4c9d67579ca8c5cfe00310ca6154315f0cfb SHA-256: 8fdba981215840065a0a1c8bf3c35cf4e287da24548ab6457e25d16c392d57d7
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple links to a known malicious redirector infrastructure, masquerading as a 'Robux Hacks 2021' generator. The document body and heuristic firings indicate a lure for users to click these links, likely to download a second-stage payload. While no scripts were explicitly extracted, the PDF format itself can embed malicious JavaScript, and the heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' suggests this capability was utilized.

Machine Learning

  • Nyx PDF Classifier clean score 0.0086

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/robux-hacks-2021-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F53 25252 bytes
SHA-256: b5cebd246433ad7d7b948b85886b42c7b66c7e54ef859723d10383a07fb76640
font_01_sfnt_off00006a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A10 2820 bytes
SHA-256: 972979c3a46100cf5f8fd289bc6fbd2496ff75fec0e3f6753648c72ec6eba714
font_02_sfnt_off000073b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73B0 18648 bytes
SHA-256: 03ab0df94635c5ebeb05191dd2fda9aa410ed650044dc459735f8f7cc99ee4ee

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