Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b839c6080d4b059…

MALICIOUS

PDF

36.6 KB Created: 2021-05-21 17:02:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 7836788d09066d3ae551110a8e4f4906 SHA-1: d1e7acd1a5d457d1eedd1449d2b38e9f58b451ef SHA-256: 4b839c6080d4b05905dedba2ad5b1ce13460c8b8de7422be2dd6f3dd0f1dd4ce
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to websites offering 'free Robux generators' and 'game hacks', which are common lures for malicious sites. The heuristic firings indicate that the PDF links to known malicious redirector infrastructure and is flagged by an ML classifier. While no scripts were extracted, the document body and embedded URLs strongly suggest a phishing or scam attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9463

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-generator-for-roblox-2021-game-hack In PDF document text
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/free-printable-roblox-coloring-pages_GM431946152.pdfIn PDF document text
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/how-to-make-your-own-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/best-minecraft-hacked-client-2021_GM479516143.pdfIn PDF document text
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/coin-master-hack-mod-apk-35-8_GM406889139.pdfIn PDF document text
    • https://rblx.landIn 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_off000032b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32B6 24876 bytes
SHA-256: 9fa780d4a50a96dd6aa330483e3a9226e401207e9cd07fcfdf54557a0085ac9d
font_01_sfnt_off00006be0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BE0 18820 bytes
SHA-256: ebe9c90542e8fe2fea15c90130dc88571bff9717049b6ef0e566bae53a322baf

Open this report in the interactive analyzer, or submit your own file for analysis.