Malicious PDF — malware analysis report

Static analysis result for SHA-256 21f8b48f20d8a1e9…

MALICIOUS

PDF

33.4 KB Created: 2021-06-25 23:15:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 05f5d4a28ca65bbb581dd39cfae2e510 SHA-1: 231681893a2d3ef28225ba7e792a6421e9d771d6 SHA-256: 21f8b48f20d8a1e968cae310a1dd93a82632e03183ddace7fccea4ce81b0c19b
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous embedded URLs that link to pages offering game hacks and cheats for popular games like Roblox and Coin Master. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm designed to attract users. The ML classifier also flagged this PDF as malicious with high confidence. The presence of these links and the ML detection strongly suggest an attempt to lure users to malicious sites, likely for malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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-red-boy-hack-game-hack PDF link annotation
    • http://educhina.mn/editor/files/free-unlimited-coin-master-online-tool_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/coin-master-hack-without-root_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/roblox-bloxburg-hack_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/ban-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/is-minecraft-free-on-pc_GM479516143.pdfIn PDF document text
    • http://educhina.mn/editor/files/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/how-to-be-able-to-open-cheat-engine-in-roblox_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/pro-gaming-hacks-com-roblox_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/minecraft-life-hacks_GM479516143.pdfIn PDF document text
    • http://educhina.mn/editor/files/fre-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/coin-master-tool-hack_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/how-to-get-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/coin-master-free-coins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/adidas-roblox-t-shirt-free_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/hot-to-get-money-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/roblox-hacking-website_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/how-to-hack-roblox-to-get-free-robux_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_off00002cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CEF 22008 bytes
SHA-256: ce2b4eb1a8af0746d77363561a0749deb085ef0f8308f91dbec1ed1566e867aa
font_01_sfnt_off00005d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D71 19012 bytes
SHA-256: 8a5e87a9e8f9ea33b54c32e5a8c51fc353e4e02a460b4a1b17d988f603d5f145

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