Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9f1795721867a4…

MALICIOUS

PDF

33.9 KB Created: 2021-06-27 07:52:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: ca77ff70a2ae237a4912a969f2b263cf SHA-1: b56067a8cb444cfd3416be2f23e75e8566e70a8b SHA-256: 8c9f1795721867a472cdbdfcebd11d70f8b63cca1276b5f3e036c7b3b3b6f9ed
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector domains, specifically advertising 'free generators' and 'game hacks' for popular games like Roblox. The primary lure URL, http://netcdn.co/app/431946152/roblox-fake-cheat-game-hack, is flagged as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a social engineering attack designed to lead users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/roblox-fake-cheat-game-hack In PDF document text
    • https://kldcardio.ru/images/free-bedrock-minecraft_GM479516143.pdfIn PDF document text
    • https://kldcardio.ru/images/night-of-the-werewolf-roblox-hack_GM431946152.pdfIn PDF document text
    • https://kldcardio.ru/images/free-tiktok-likes-no-survey_GM835599320.pdfIn PDF document text
    • https://kldcardio.ru/images/robloxgainer-free-robux_GM431946152.pdfIn PDF document text
    • https://kldcardio.ru/images/free-robux-now-get-it_GM431946152.pdfIn PDF document text
    • https://kldcardio.ru/images/free-robux-obby_GM431946152.pdfIn PDF document text
    • https://kldcardio.ru/images/roblox-hacking-with-mr-bean_GM431946152.pdfIn PDF document text
    • https://kldcardio.ru/images/roblox-hack-me_GM431946152.pdfIn PDF document text
    • https://kldcardio.ru/images/how-to-get-robux-on-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • https://kldcardio.ru/images/cmo-puedo-hackear-roblox-en-computadora_GM431946152.pdfIn PDF document text
    • https://kldcardio.ru/images/free-robux-and-builderclub_GM431946152.pdfIn PDF document text
    • https://kldcardio.ru/images/free-roblox-groups_GM431946152.pdfIn PDF document text
    • https://kldcardio.ru/images/how-to-get-robux-for-free-and-fast_GM431946152.pdfIn PDF document text
    • https://kldcardio.ru/images/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • https://kldcardio.ru/images/como-hackear-para-tener-robux-roblox_GM431946152.pdfIn PDF document text
    • https://kldcardio.ru/images/free-admin-roblox-how-to-turn-itto-others_GM431946152.pdfIn PDF document text
    • https://kldcardio.ru/images/minecraft-free-no-download_GM479516143.pdfIn PDF document text
    • https://kldcardio.ru/images/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • https://kldcardio.ru/images/free-roblox-accounts-for-phantom-forces_GM431946152.pdfIn PDF document text
    • https://kldcardio.ru/images/how-to-hack-roblox-on-ios_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002c2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C2F 22820 bytes
SHA-256: d84f3b993dcdd09c8ee3dea4ae047e8e900ceec903e4a880d3fa8c6444a32a65
font_01_sfnt_off00005f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F65 19088 bytes
SHA-256: 150718db6071b7d6dd6d9f2061ade224f6d3ebb865a2e45e644ccb28d5614dbe

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