Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef772df89d06dac4…

MALICIOUS

PDF

38.4 KB Created: 2021-05-17 18:30:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 36dc52cdfaa74bdf250b67b93a7b77f9 SHA-1: 2defd2c16b435404104110fb2b1ce2e5aee35ae7 SHA-256: ef772df89d06dac4fcbe107bd479c427e393a5b5664cfa3bf8b1c9188cdea2a5
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that redirects to a 'free generator / game hack' lure, indicating a social engineering attempt to trick users into visiting malicious infrastructure. The document body and heuristics confirm the presence of a malicious redirector URL. No scripts were extracted from this sample.

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-earn-robux-for-free-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_off000035ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35AE 26152 bytes
SHA-256: 957b0da1825c7ca69f4fefd8c7cff376b73dfb86aef205b8bee36296bcecfab1
font_01_sfnt_off00007314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7314 18808 bytes
SHA-256: 177d88bc60daff4309aceb58336b2ba1d1983158bcd2aa353c0aa46f075a8142