Malicious PDF — malware analysis report

Static analysis result for SHA-256 28a73776ce5b21ec…

MALICIOUS

PDF

34.2 KB Created: 2021-07-06 07:22:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 0257bd4a1a0d77cec7aef5ed3f4ac452 SHA-1: f548b45334d312a7dbe8445404c98b29492d89ef SHA-256: 28a73776ce5b21ec7c912c34ee1d380538da2a2d1008c6cda5ba5c1c82b22ebf
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs and a 'DOC BODY' excerpt that explicitly mentions 'Instantrobux' and directs users to download game hacks. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, many of which are related to free Robux or game exploits. This suggests the document is designed to trick users into visiting malicious sites or downloading malware under the guise of in-game currency or cheats.

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/431946152/instantrobux-game-hack
    • https://e-learning.man4pandeglang.sch.id/__statics/gudangsoal/files/free-robux-no-gift-card_GM431946152.pdf
    • https://e-learning.man4pandeglang.sch.id/__statics/gudangsoal/files/websites-to-get-free-robux_GM431946152.pdf
    • https://e-learning.man4pandeglang.sch.id/__statics/gudangsoal/files/free-robux-today_GM431946152.pdf
    • https://e-learning.man4pandeglang.sch.id/__statics/gudangsoal/files/roblox-codes-rob-the-bank-hack_GM431946152.pdf
    • https://e-learning.man4pandeglang.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-blogspot-today_GM406889139.pdf
    • https://e-learning.man4pandeglang.sch.id/__statics/gudangsoal/files/free-robux-hack-copy-and-paste_GM431946152.pdf
    • https://e-learning.man4pandeglang.sch.id/__statics/gudangsoal/files/gratis-und-sicher-free-robux-bekommen-hacking_GM431946152.pdf
    • https://e-learning.man4pandeglang.sch.id/__statics/gudangsoal/files/free-tonk-roblox_GM431946152.pdf
    • https://e-learning.man4pandeglang.sch.id/__statics/gudangsoal/files/free-daily-spins-coin-master_GM406889139.pdf
    • https://e-learning.man4pandeglang.sch.id/__statics/gudangsoal/files/free-code-for-huge-cat-pet-in-roblox-2021_GM431946152.pdf
    • https://e-learning.man4pandeglang.sch.id/__statics/gudangsoal/files/https-oprewards-com-roblox_GM431946152.pdf
    • https://e-learning.man4pandeglang.sch.id/__statics/gudangsoal/files/minecraft-116-apk-download_GM479516143.pdf
    • https://e-learning.man4pandeglang.sch.id/__statics/gudangsoal/files/hack-tool-roblox-pokemon_GM431946152.pdf
    • https://e-learning.man4pandeglang.sch.id/__statics/gudangsoal/files/get-robux-today_GM431946152.pdf
    • https://e-learning.man4pandeglang.sch.id/__statics/gudangsoal/files/update-coin-master-free-spins_GM406889139.pdf
    • https://e-learning.man4pandeglang.sch.id/__statics/gudangsoal/files/get-free-robux-with-no-survey_GM431946152.pdf
    • https://e-learning.man4pandeglang.sch.id/__statics/gudangsoal/files/how-can-i-get-free-coinsn-coin-master_GM406889139.pdf
    • https://e-learning.man4pandeglang.sch.id/__statics/gudangsoal/files/roblox-controversy_GM431946152.pdf
    • https://e-learning.man4pandeglang.sch.id/__statics/gudangsoal/files/how-to-get-hacks-on-minecraft_GM479516143.pdf
    • https://e-learning.man4pandeglang.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-instructions_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000302e.bin
919080a2aed72062f17175147f02dfc344123e57bac7dbd197a85d70ac82dd73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x302E 22204 bytes
font_01_sfnt_off000061c4.bin
5a13a4ba7d4aa3ba564163d7fd1f4e40de414e0c8b16d10ac9018e4301010f0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61C4 18656 bytes

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