Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b7e13dd62174edf…

MALICIOUS

PDF

36.1 KB Created: 2021-06-30 19:12:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: f0f740e8f8da8caba12000f60d6dc2b3 SHA-1: 47e0da800f8b5d75cd70fa653a05a685a042ff4b SHA-256: 1b7e13dd62174edf68fe844800281bdbbf77a0f2697be49670bb8162d45bf7dc
102 Risk Score

Malware Insights

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

The PDF document contains numerous links to external resources, many of which are SEO-optimized PDFs hosted on a compromised domain, suggesting a link farm or content-laundering operation. The document body and extracted URLs explicitly mention 'free Robux', 'game hacks', and 'cheats', indicating a lure for potentially malicious downloads or scams. The ML classifier also strongly flagged this PDF as malicious.

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-2021-robux-for-free-game-hack
    • https://www.advancissurgical.com/uploads/files/files/synapse-roblox-free-june-2021_GM431946152.pdf
    • https://www.advancissurgical.com/uploads/files/files/how-to-get-minecraft-dungeons-for-free_GM479516143.pdf
    • https://www.advancissurgical.com/uploads/files/files/cheat-engine-undetected-roblox_GM431946152.pdf
    • https://www.advancissurgical.com/uploads/files/files/all-links-for-free-spins-coin-master_GM406889139.pdf
    • https://www.advancissurgical.com/uploads/files/files/free-coin-master-spins-daily_GM406889139.pdf
    • https://www.advancissurgical.com/uploads/files/files/hey-google-how-do-you-get-free-robux_GM431946152.pdf
    • https://www.advancissurgical.com/uploads/files/files/how-to-get-free-robux-hack_GM431946152.pdf
    • https://www.advancissurgical.com/uploads/files/files/roblox-survivor-script-hack-pastebin_GM431946152.pdf
    • https://www.advancissurgical.com/uploads/files/files/free-minecraft-capes-no-mods_GM479516143.pdf
    • https://www.advancissurgical.com/uploads/files/files/roblox-join-players-that-arent-freind-hack_GM431946152.pdf
    • https://www.advancissurgical.com/uploads/files/files/free-unlimited-coin-master-400-spin-link_GM406889139.pdf
    • https://www.advancissurgical.com/uploads/files/files/free-coin-master-coins_GM406889139.pdf
    • https://www.advancissurgical.com/uploads/files/files/how-to-get-robux-with-cheat-engine-62_GM431946152.pdf
    • https://www.advancissurgical.com/uploads/files/files/coin-master-heaven-free-spins-and-coins_GM406889139.pdf
    • https://www.advancissurgical.com/uploads/files/files/hacks-for-coin-master_GM406889139.pdf
    • https://www.advancissurgical.com/uploads/files/files/minecraft-116-free-download_GM479516143.pdf
    • https://www.advancissurgical.com/uploads/files/files/roblox-studio-hack-message_GM431946152.pdf
    • https://www.advancissurgical.com/uploads/files/files/coin-master-35-13-hack-download_GM406889139.pdf
    • https://www.advancissurgical.com/uploads/files/files/how-to-get-free-robux-no-youtube_GM431946152.pdf
    • https://www.advancissurgical.com/uploads/files/files/free-robux-without-survey_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003433.bin
0a5a9cb7467de28a0a1e6ab78e28c917253726751b6e8a28981af6c96415e710		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3433 22776 bytes
font_01_sfnt_off000066de.bin
d24c0e100c944da15398cc03dd439e143cfc9f9497013523985f2333f6259ff5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66DE 19384 bytes

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