Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3ebff0cbb21e4f5…

MALICIOUS

PDF

41.2 KB Created: 2021-05-21 23:06:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: c513d4d6cf6ddebdfb4553f9c159704b SHA-1: d0a338b01f45914a84302a3fca2e20ca8430b6c9 SHA-256: d3ebff0cbb21e4f5b66336cf569fd79541a781b78757ac12d610241e9b0c489a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to websites offering 'free Robux' and 'game hacks', which are common lures for malicious content. The heuristic PDF_GAME_HACK_REDIRECT_LURE specifically identifies these links as pointing to redirectors. While no scripts were extracted, the document body and embedded URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6895

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-websites-no-human-verification-game-hack In PDF document text
    • http://en.gzyuquan.com/Public/upload/editorfiles/coin-master-cheats-2021_GM406889139.pdfIn PDF document text
    • http://en.gzyuquan.com/Public/upload/editorfiles/coin-master-codes_GM406889139.pdfIn PDF document text
    • http://en.gzyuquan.com/Public/upload/editorfiles/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • http://en.gzyuquan.com/Public/upload/editorfiles/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://en.gzyuquan.com/Public/upload/editorfiles/how-to-get-java-minecraft-free_GM479516143.pdfIn 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
stream_002_off00003513.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3513 26532 bytes
SHA-256: fe49c15e4aeecc7eed71b4323e7a5db7427055adfda0b5003e36354686db6be0
font_01_sfnt_off00007325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7325 2984 bytes
SHA-256: 889cfc2fd0afa9ea114d6666204c6ce0548d0aae2cba345827d317498c4c06bc
font_02_sfnt_off00007d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D50 19056 bytes
SHA-256: b278ed256549c6e4f6c448dba943d0e72c7f64ebe7340c12334ea4705f26c648

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