Malicious PDF — malware analysis report

Static analysis result for SHA-256 c19a0fce606971ab…

MALICIOUS

PDF

54.1 KB Created: 2021-06-07 09:35:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 84ce2d337bf409a370972f850ca7653f SHA-1: b9c193968d22db6ca8b09d25b440bf0850b0e08e SHA-256: c19a0fce606971ab241593af9f7b6ce84cb530cc083e68c2ec11021db54e9744
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically promoting 'free generator' and 'game hack' lures. The ML classifier also flagged this PDF as malicious. These findings indicate a likely attempt to direct users to malicious websites for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9491

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.tw/app/431946152/kristjon-15k-robux-reward-hack-tutorial-game-hack In PDF document text
    • http://gc-sistemas.com.ar/images/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/rewards-roblox_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/minecraft-mobile-free_GM479516143.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/robux-free-gift-card_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/free-robux-generator-2021-no-survey_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/get-free-spins-coin-master-october-2021_GM406889139.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/free-realistic-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/minecraft-pocket-apk_GM479516143.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/how-to-get-free-shields-on-coin-master_GM406889139.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/easy-roblox-today_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/minecraft-packs-free_GM479516143.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/free-exploits-for-roblox_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/can-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000500a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x500A 29164 bytes
SHA-256: 73089fec4afff3c4c171ed17da7001b3f81609fcd24d98e041b85c3af85bb41a
font_01_sfnt_off0000936d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x936D 3992 bytes
SHA-256: 43e72e756231cfd354bd65c2ed3b09ad4eff56ad11e7f155ed2920e6bb7860dd
font_02_sfnt_off0000a08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA08E 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_03_sfnt_off0000ada0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADA0 19312 bytes
SHA-256: e0761a3bfd61ebeb38e45aebfc9358347ba3dc9da57d089a291891e2bc2c2dcd

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