Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfa4b54531cab33a…

MALICIOUS

PDF

42.3 KB Created: 2021-05-17 14:30:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 520996003dec2a1111882fb771ba2a21 SHA-1: 9d4219bd39f6f23c776a37c996a7090e8311c071 SHA-256: cfa4b54531cab33a8a388725714da1205a2e8fbccec7e5ca8ec5511b862581e4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and lures users with 'free generator / game hack' content, indicating a phishing or malware distribution attempt. The embedded links, such as 'https://netcdn.xyz/app/406889139/free-coin-master-spins-game-hack', are designed to lead users to potentially harmful websites. The presence of a visual download button further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/free-coin-master-spins-game-hack In PDF document text
    • https://e-learningmin7jakarta.com/__statics/gudangsoal/files/coin-master-hack-1021_GM406889139.pdfIn PDF document text
    • http://e-learningmin7jakarta.com/__statics/gudangsoal/files/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • http://e-learningmin7jakarta.com/__statics/gudangsoal/files/free-spin-link-in-coin-master-game_GM406889139.pdfIn PDF document text
    • https://e-learningmin7jakarta.com/__statics/gudangsoal/files/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://e-learningmin7jakarta.com/__statics/gudangsoal/files/coin-master-free-spins-link-2021-twitter_GM406889139.pdfIn PDF document text
    • http://e-learningmin7jakarta.com/__statics/gudangsoal/files/free-minecraft-skin-maker_GM479516143.pdfIn PDF document text
    • http://e-learningmin7jakarta.com/__statics/gudangsoal/files/where-can-i-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://e-learningmin7jakarta.com/__statics/gudangsoal/files/haktuts-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://e-learningmin7jakarta.com/__statics/gudangsoal/files/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://e-learningmin7jakarta.com/__statics/gudangsoal/files/how-to-get-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://e-learningmin7jakarta.com/__statics/gudangsoal/files/minecraft-java-edition-code-free_GM479516143.pdfIn PDF document text
    • http://e-learningmin7jakarta.com/__statics/gudangsoal/files/robux-converter_GM431946152.pdfIn PDF document text
    • http://e-learningmin7jakarta.com/__statics/gudangsoal/files/coin-master-free-spin-daily-bonus_GM406889139.pdfIn PDF document text
    • http://e-learningmin7jakarta.com/__statics/gudangsoal/files/bit-ly-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://e-learningmin7jakarta.com/__statics/gudangsoal/files/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
    • https://e-learningmin7jakarta.com/__statics/gudangsoal/files/coin-master-hack-2021-free_GM406889139.pdfIn PDF document text
    • http://e-learningmin7jakarta.com/__statics/gudangsoal/files/robux-premium_GM431946152.pdfIn PDF document text
    • https://e-learningmin7jakarta.com/__statics/gudangsoal/files/robux-app_GM431946152.pdfIn PDF document text
    • http://e-learningmin7jakarta.com/__statics/gudangsoal/files/coin-master-key-free-spin_GM406889139.pdfIn PDF document text
    • https://e-learningmin7jakarta.com/__statics/gudangsoal/files/minecraft-kill-aura_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_003_off00004b38.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B38 24756 bytes
SHA-256: c7d6f60af3f08dc6b4deb0e82ad3fe0cd82cbdb45be1df0e9b0451fd5a8cff0b
font_01_sfnt_off0000841e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x841E 17884 bytes
SHA-256: dbba0adc3b1b7bb8b2e5e51fec5d28ab169e2f7a165ed2a14d616932af559aea

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