Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bb5dce24e4366d1…

MALICIOUS

PDF

33.8 KB Created: 2021-07-02 03:37:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 52cc4e869c507229c89a39da2154386d SHA-1: 827d4505c9bbebe3d36e20d0eb470db4bdf5559d SHA-256: 3bb5dce24e4366d160fc98e00fd93087dee4f56bad92af1823aa4839ead8c769
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, many of which are generated SEO-style links pointing to sites offering free in-game currency or hacks for popular games like Roblox and Coin Master. The ML classifier strongly indicates maliciousness, and the presence of a link farm suggests a phishing or malware distribution attempt. The document body and heuristics indicate a lure for users seeking in-game advantages, likely leading to malicious websites.

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/earn-free-robux-fast-game-hack PDF link annotation
    • http://www.pspmrsmkber.com/opac/repository/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/free-roblox-toy-codes-not-used_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/free-real-gift-cards-codes-roblox_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/free-roblox-full-lua_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/can-you-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/best-site-for-free-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/freespinandcoinblogspot-com-2021-11-coinmasterfreespins_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/free-robux-kid-friendly-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/how-to-get-free-robux-2021-without-human-verification_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/roblox-how-to-get-passes-for-free_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/coin-master-online-hack-tool_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/download-roblox-mod-apk-free-robux_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/download-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/how-to-get-free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/new-obby-that-gives-free-robux_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/how-to-change-your-roblox-name-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/roblox-apk-hack-robux_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/roblox-prison-life-swat-gear-free_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/how-do-you-get-free-roblox_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_off00002f93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F93 21832 bytes
SHA-256: a46ec0aa910b1948097bdaea98f8ba6e67d732da0d1c18229c1613f8f1eb94b4
font_01_sfnt_off00005fb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FB8 18820 bytes
SHA-256: 9d846b3083611445dfd5cad29b58015e3a6c9d94c24f5c0eeddd0b4411b7909e

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