Malicious PDF — malware analysis report

Static analysis result for SHA-256 98391d1d4358275f…

MALICIOUS

PDF

43.5 KB Created: 2021-05-12 23:48:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f311dea7403e4948df81c8d687910a54 SHA-1: 2dd1bcf6bd1801f727fd8f6fe0a6b461014d32bc SHA-256: 98391d1d4358275f76a7c00bd6bc46725d754640eeebf796216ed5082640b73e
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body and embedded URLs suggest a lure related to game hacks (Coin Master, Roblox), indicating a phishing or scam attempt. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 3

  • 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-hack-without-verification-site-zyngaplayerforums.com-game-hack In PDF document text
    • http://ghknights.org/images/roblox-free-models_GM431946152.pdfIn PDF document text
    • https://www.ghknights.org/images/hack-coin-master-xyz_GM406889139.pdfIn PDF document text
    • https://www.ghknights.org/images/coin-master-free-spins-link-2021-app_GM406889139.pdfIn PDF document text
    • https://www.ghknights.org/images/get-free-roblox_GM431946152.pdfIn PDF document text
    • https://www.ghknights.org/images/mobihack-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.ghknights.org/images/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://ghknights.org/images/coin-master-free-rare-cards_GM406889139.pdfIn PDF document text
    • https://www.ghknights.org/images/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://www.ghknights.org/images/buy-robux-free_GM431946152.pdfIn PDF document text
    • https://www.ghknights.org/images/roblox-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://ghknights.org/images/free-minecraft-realms-to-join_GM479516143.pdfIn PDF document text
    • http://ghknights.org/images/roblox-hack-download_GM431946152.pdfIn PDF document text
    • https://www.ghknights.org/images/coin-master-free-spins-and-coins-haktuts_GM406889139.pdfIn PDF document text
    • http://ghknights.org/images/coin-master-hack-apk-35-8_GM406889139.pdfIn PDF document text
    • https://www.ghknights.org/images/official-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.ghknights.org/images/free-spin-and-coin-blogspot-com_GM406889139.pdfIn PDF document text
    • https://www.ghknights.org/images/coin-master-free-spins-link-today-instagram_GM406889139.pdfIn PDF document text
    • https://www.ghknights.org/images/free-money-links-coin-master_GM406889139.pdfIn PDF document text
    • http://ghknights.org/images/coin-master-free-spins-hack-but-no-surveys_GM406889139.pdfIn PDF document text
    • http://ghknights.org/images/get-free-robux-gg_GM431946152.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
font_00_sfnt_off00004a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A58 25716 bytes
SHA-256: 663e6779cface4aab0a3c91cc33e399d9a7c95b176509b102c7fb0845ebc10a8
font_01_sfnt_off00008461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8461 19492 bytes
SHA-256: d42cd4a3ab6d974a23394c8be713da621cd6497735f7b6d74e749fa263947452

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