Malicious PDF — malware analysis report

Static analysis result for SHA-256 f599bb60fd96b121…

MALICIOUS

PDF

37.0 KB Created: 2021-06-29 03:03:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: f7da868e28dc81e248de21eda2bcdd76 SHA-1: ecd3aacf75c2b9ff94652de49aada50e1a051e1c SHA-256: f599bb60fd96b1214c91eab28cf597b888c3198ee7d398f32f29a6ff4940fc75
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are SEO-optimized to appear as legitimate guides for obtaining free in-game currency or hacks. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, and the ML classifier strongly flags this PDF as malicious. The document body, though partially corrupted, contains phrases related to 'free Robux' and 'game hack', reinforcing the lure. The primary attack pattern involves directing users to potentially malicious sites via these links, likely for credential harvesting or 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/how-to-get-free-robux-on-roblox-on-ipad-2021-game-hack
    • https://elearning.min5bm.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdf
    • https://elearning.min5bm.sch.id/__statics/gudangsoal/files/online-hacking-tricks-coin-master_GM406889139.pdf
    • https://elearning.min5bm.sch.id/__statics/gudangsoal/files/coin-master-free-coins-today_GM406889139.pdf
    • https://elearning.min5bm.sch.id/__statics/gudangsoal/files/the-coin-master-hack_GM406889139.pdf
    • https://elearning.min5bm.sch.id/__statics/gudangsoal/files/master-hack-coin_GM406889139.pdf
    • https://elearning.min5bm.sch.id/__statics/gudangsoal/files/get-free-robux-without-doing-anything_GM431946152.pdf
    • https://elearning.min5bm.sch.id/__statics/gudangsoal/files/can-you-still-get-minecraft-windows-10-for-free_GM479516143.pdf
    • https://elearning.min5bm.sch.id/__statics/gudangsoal/files/how-do-i-get-free-robux-on-roblox_GM431946152.pdf
    • https://elearning.min5bm.sch.id/__statics/gudangsoal/files/minecraft-aimbot_GM479516143.pdf
    • https://elearning.min5bm.sch.id/__statics/gudangsoal/files/minecraft-noob-vs-pro-vs-hacker-vs-god_GM479516143.pdf
    • https://elearning.min5bm.sch.id/__statics/gudangsoal/files/how-to-make-a-minecraft-pe-server-for-free_GM479516143.pdf
    • https://elearning.min5bm.sch.id/__statics/gudangsoal/files/get-free-robux-com_GM431946152.pdf
    • https://elearning.min5bm.sch.id/__statics/gudangsoal/files/robux-free-2021_GM431946152.pdf
    • https://elearning.min5bm.sch.id/__statics/gudangsoal/files/coin-master-daily-free-spins-link_GM406889139.pdf
    • https://elearning.min5bm.sch.id/__statics/gudangsoal/files/free-roblox-hack_GM431946152.pdf
    • https://elearning.min5bm.sch.id/__statics/gudangsoal/files/coin-master-email-free-spins_GM406889139.pdf
    • https://elearning.min5bm.sch.id/__statics/gudangsoal/files/free-suit-in-roblox_GM431946152.pdf
    • https://elearning.min5bm.sch.id/__statics/gudangsoal/files/free-robux-without-any-verification_GM431946152.pdf
    • https://elearning.min5bm.sch.id/__statics/gudangsoal/files/earn-free-robux-for-roblox_GM431946152.pdf
    • https://elearning.min5bm.sch.id/__statics/gudangsoal/files/hack-for-apocalips-rising-roblox_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003740.bin
93c88fa33c3b05d60e70ac0b63a1cff813be831e7883a1aa1736fa4176236201		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3740 22424 bytes
font_01_sfnt_off0000695a.bin
ce714914a5341a1951c6b5f3e3965a890466fee364717f894aedfd58908b89d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x695A 19812 bytes

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