Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7f400d0e8eb856c…

MALICIOUS

PDF

42.8 KB Created: 2021-06-03 12:04:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 01a79dc16ef8f93597cd1278c8a0d2ae SHA-1: d499e36ac372540017f438a63ff0945f5d31da8c SHA-256: d7f400d0e8eb856c0415fd15b6c6f466e136c1b41894656e784c0a7b242ff204
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and hosts further malicious PDFs, masquerading as game hacks and currency generators. The document body and embedded links are designed to lure users into clicking through to potentially malicious sites. The ML classifier strongly indicated maliciousness, and the heuristics confirm the use of redirectors and lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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.online/app/406889139/coin-master-heaven-free-spins-and-coins-game-hack In PDF document text
    • https://ifef.es/ckfinder/userfiles/files/coin-master-hacks_GM406889139.pdfIn PDF document text
    • https://ifef.es/ckfinder/userfiles/files/coin-master-get-free-spins_GM406889139.pdfIn PDF document text
    • https://ifef.es/ckfinder/userfiles/files/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • https://ifef.es/ckfinder/userfiles/files/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • https://ifef.es/ckfinder/userfiles/files/free-100-robux_GM431946152.pdfIn PDF document text
    • https://ifef.es/ckfinder/userfiles/files/minecraft-free-download-2021_GM479516143.pdfIn PDF document text
    • https://ifef.es/ckfinder/userfiles/files/coin-master-hack-spin_GM406889139.pdfIn PDF document text
    • https://ifef.es/ckfinder/userfiles/files/how-to-get-free-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://ifef.es/ckfinder/userfiles/files/robux-com-free_GM431946152.pdfIn PDF document text
    • https://ifef.es/ckfinder/userfiles/files/are-robux-generators-safe_GM431946152.pdfIn PDF document text
    • https://ifef.es/ckfinder/userfiles/files/free-tiktok-like_GM835599320.pdfIn PDF document text
    • https://ifef.es/ckfinder/userfiles/files/free-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://ifef.es/ckfinder/userfiles/files/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • https://ifef.es/ckfinder/userfiles/files/jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • https://ifef.es/ckfinder/userfiles/files/free-coin-app_GM406889139.pdfIn PDF document text
    • https://ifef.es/ckfinder/userfiles/files/robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • https://ifef.es/ckfinder/userfiles/files/robux-free-co_GM431946152.pdfIn PDF document text
    • https://ifef.es/ckfinder/userfiles/files/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
    • https://ifef.es/ckfinder/userfiles/files/minecraft-free-no-virus_GM479516143.pdfIn PDF document text
    • https://ifef.es/ckfinder/userfiles/files/free-minecraft-skins-ps4_GM479516143.pdfIn 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
stream_004_off00004e0c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E0C 24068 bytes
SHA-256: aad749b3fb237ad00394b9de76199c82ff21fb6c81afd3e30d08d8d190ecaa90
font_01_sfnt_off000084b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84B9 18172 bytes
SHA-256: bdd24314abe2f3b39aecf21834c7cd26032852c94e6fb36ef69e936b1b82ae40

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