Malicious PDF — malware analysis report

Static analysis result for SHA-256 19f28dfc668de55e…

MALICIOUS

PDF

35.2 KB Created: 2021-06-19 01:29:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 03d7dbfc6149df3338d57311df85bd9c SHA-1: d6c3d608bc1d94722104ae30ad79bff0ef205b6d SHA-256: 19f28dfc668de55e192a64884e08508f5af481977b1ef7049ef5cb4c8782042e
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded links, many of which point to pages offering 'free Robux' or similar game-related cheats. 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 primary attack pattern involves luring users to external sites via deceptive content.

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/how-to-get-free-robux-on-your-tablet-game-hack
    • https://elearning.man-purbalingga.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-no-verification-2021_GM431946152.pdf
    • https://elearning.man-purbalingga.sch.id/__statics/gudangsoal/files/how-to-get-20210-robux-for-free_GM431946152.pdf
    • https://elearning.man-purbalingga.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-app_GM431946152.pdf
    • https://elearning.man-purbalingga.sch.id/__statics/gudangsoal/files/free-spins-coin-master-links-2021_GM406889139.pdf
    • https://elearning.man-purbalingga.sch.id/__statics/gudangsoal/files/how-to-hack-peoples-roblox-accounts_GM431946152.pdf
    • https://elearning.man-purbalingga.sch.id/__statics/gudangsoal/files/how-to-make-my-own-coin-master-cards-hack_GM406889139.pdf
    • https://elearning.man-purbalingga.sch.id/__statics/gudangsoal/files/robux-code-2021-free_GM431946152.pdf
    • https://elearning.man-purbalingga.sch.id/__statics/gudangsoal/files/the-coin-master-hack_GM406889139.pdf
    • https://elearning.man-purbalingga.sch.id/__statics/gudangsoal/files/how-to-get-free-hair-on-roblox_GM431946152.pdf
    • https://elearning.man-purbalingga.sch.id/__statics/gudangsoal/files/free-spins-coin-master-2021-today_GM406889139.pdf
    • https://elearning.man-purbalingga.sch.id/__statics/gudangsoal/files/how-to-get-java-minecraft-for-free_GM479516143.pdf
    • https://elearning.man-purbalingga.sch.id/__statics/gudangsoal/files/uprobuxcom-free-robux_GM431946152.pdf
    • https://elearning.man-purbalingga.sch.id/__statics/gudangsoal/files/easy-how-to-get-free-robux_GM431946152.pdf
    • https://elearning.man-purbalingga.sch.id/__statics/gudangsoal/files/how-to-get-a-free-monster-truck-in-roblox-jailbreak_GM431946152.pdf
    • https://elearning.man-purbalingga.sch.id/__statics/gudangsoal/files/is-there-a-way-to-get-free-robux_GM431946152.pdf
    • https://elearning.man-purbalingga.sch.id/__statics/gudangsoal/files/coin-master-2021-free-spins_GM406889139.pdf
    • https://elearning.man-purbalingga.sch.id/__statics/gudangsoal/files/free-spins-and-coins-coin-master-link-2021_GM406889139.pdf
    • https://elearning.man-purbalingga.sch.id/__statics/gudangsoal/files/free-roblox-games-for-free_GM431946152.pdf
    • https://elearning.man-purbalingga.sch.id/__statics/gudangsoal/files/coin-master-stop-attack-hack_GM406889139.pdf
    • https://elearning.man-purbalingga.sch.id/__statics/gudangsoal/files/coin-master-hack-without-verification-code_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000318f.bin
1a90fc8a129a37865a84a16c40d28606d3430db0e343e7dadd8c9c244c52e627		 pdf-font-stream PDF embedded font (sfnt) at offset 0x318F 22652 bytes
font_01_sfnt_off00006423.bin
6ba983da29e995d4c7451758dcd0c36e516508856fda519f51669842dd22b5ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6423 19220 bytes

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