Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a40c7fea76676d6…

MALICIOUS

PDF

35.0 KB Created: 2021-07-05 00:57:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: e74d5e84f79ad6cedb5e6bf96a3b40e2 SHA-1: 641971dceac69b2e5d94b3f495014bdfc4aedc94 SHA-256: 5a40c7fea76676d6778f27d47239225c6b0bc0aae4721f8ff21912d94288ce9c
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links to external websites, identified as a link farm for SEO spam. The document body and extracted URLs suggest a lure related to free in-game items and currency for popular games like Coin Master and Roblox. The ML classifier strongly indicated maliciousness, and the presence of many external links points towards a malicious workflow, likely to distribute malware or engage in phishing.

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.tw/app/406889139/free-spins-and-coins-for-coin-master-game-game-hack
    • http://library.yamasi.ac.id/repository/free-promo-codes-2021-october-roblox_GM431946152.pdf
    • http://library.yamasi.ac.id/repository/coin-master-free-500-spins-link_GM406889139.pdf
    • http://library.yamasi.ac.id//repository/coin-master-cheats-without-verification_GM406889139.pdf
    • http://library.yamasi.ac.id/repository/moonactive-free-spins-link_GM406889139.pdf
    • http://library.yamasi.ac.id/repository/roblox-royale-high-diamond-hack_GM431946152.pdf
    • http://library.yamasi.ac.id/repository/rblx-city-earn-free-robux_GM431946152.pdf
    • http://library.yamasi.ac.id/repository/roblox-hack-scripts-for-ipad_GM431946152.pdf
    • http://library.yamasi.ac.id//repository/free-minecraft-skins-java_GM479516143.pdf
    • http://library.yamasi.ac.id/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdf
    • http://library.yamasi.ac.id/repository/how-to-work-get-a-roblox-hack-gui-to-work_GM431946152.pdf
    • http://library.yamasi.ac.id/repository/roblox-robux-hack-download-free-2021_GM431946152.pdf
    • http://library.yamasi.ac.id//repository/how-to-start-a-minecraft-server-for-free_GM479516143.pdf
    • http://library.yamasi.ac.id/repository/how-to-get-more-free-coins-on-coin-master_GM406889139.pdf
    • http://library.yamasi.ac.id//repository/coin-master-free-spins-and-coins_GM406889139.pdf
    • http://library.yamasi.ac.id/repository/games-that-give-you-free-robux-on-roblox_GM431946152.pdf
    • http://library.yamasi.ac.id/repository/how-to-get-gold-cards-on-coin-master-hack_GM406889139.pdf
    • http://library.yamasi.ac.id//repository/games-that-give-free-robux_GM431946152.pdf
    • http://library.yamasi.ac.id/repository/roblox-cbro-how-to-get-free-knife_GM431946152.pdf
    • http://library.yamasi.ac.id/repository/roblox-anti-afk-hack_GM431946152.pdf
    • http://library.yamasi.ac.id/repository/op-rewards-free-robux-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003235.bin
44bcf1f6fe8070e266371b63bb32f10050b6a7d697d1b5fe5fba2ab0aca0f03b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3235 22724 bytes
font_01_sfnt_off00006513.bin
31982f023cf9e8334e0247a56239ce43a369afef10c4502d97e5781750ca878f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6513 18608 bytes

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