Malicious PDF — malware analysis report

Static analysis result for SHA-256 efaf964cd6605626…

MALICIOUS

PDF

38.8 KB Created: 2021-05-22 07:05:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: ed2d194640d66f71becb11bc63007784 SHA-1: 7a126c025562c00222204e7dcfe0391abd8a1e1d SHA-256: efaf964cd66056265b3cc8464142f3ca0a1c81ac6794eea7b4e5f7fb60b6405f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to websites offering game hacks and free currency, which are common lures for malicious content. The heuristic firings confirm these links point to known malicious redirectors and a general ML classification of maliciousness. While no scripts were explicitly extracted, the document body and embedded URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8060

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/406889139/coin-master-free-spins-and-coins-game-hack In PDF document text
    • http://vibrato.fr/images/roblox-speed-hack_GM431946152.pdfIn PDF document text
    • http://vibrato.fr/images/coin-master-hack-spins-and-coins-unlimited-free_GM406889139.pdfIn PDF document text
    • http://vibrato.fr/images/how-to-get-free-robux-on-chromebook_GM431946152.pdfIn PDF document text
    • http://vibrato.fr/images/free-tiktok-followers-generator_GM835599320.pdfIn PDF document text
    • http://vibrato.fr/images/minecraft-java-edition-free-download-for-android_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_off000034cc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x34CC 24676 bytes
SHA-256: 4f237743cafbd59dc2cb1c73b08d547de88c968575039cf445828ae122924672
font_01_sfnt_off00006cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CFC 2880 bytes
SHA-256: 93b508a52e047ef4bff1d7d250d9aefd838e5a176ceb5e9be36ada0f8d333e07
font_02_sfnt_off000076eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76EB 18060 bytes
SHA-256: 7f8980b6f3213b204c7b050e62c653166806b65682437d624869b2fc7a4cb6a7

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