Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4505977bb9f803e…

MALICIOUS

PDF

32.5 KB Created: 2021-06-29 18:08:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: ffc106dc046496b9a9bb230f0cd1c856 SHA-1: 7686eded80e79fb39f416a7b283cfa006924b0db SHA-256: a4505977bb9f803efb649f50dfab0f8cfef613f00cd3e1af3e856115bcfd7273
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains a large number of external links, many of which point to other PDF files with SEO-like titles related to game hacking and free currency. This suggests a link farm designed to lure users into downloading or visiting malicious content. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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-become-a-hacker-in-roblox-on-phone-game-hack
    • http://perpustakaan.ipts.ac.id/repository/free-roblox-toy-codes-not-used_GM431946152.pdf
    • http://perpustakaan.ipts.ac.id/repository/mad-city-roblox-hack-apk_GM431946152.pdf
    • http://perpustakaan.ipts.ac.id/repository/free-coin-master-spins-without-human-verification_GM406889139.pdf
    • http://perpustakaan.ipts.ac.id/repository/how-to-get-free-robux-com_GM431946152.pdf
    • http://perpustakaan.ipts.ac.id/repository/hack-coin-master-apk-ios_GM406889139.pdf
    • http://perpustakaan.ipts.ac.id/repository/como-hackear-tener-robux-gratis-con-bots_GM431946152.pdf
    • http://perpustakaan.ipts.ac.id/repository/free-roblox-uncopylocked-games_GM431946152.pdf
    • http://perpustakaan.ipts.ac.id/repository/roblox-hack-codes_GM431946152.pdf
    • http://perpustakaan.ipts.ac.id/repository/100-robux_GM431946152.pdf
    • http://perpustakaan.ipts.ac.id/repository/what-do-you-do-when-someone-hacks-your-roblox-account_GM431946152.pdf
    • http://perpustakaan.ipts.ac.id/repository/facebook-coin-master_GM406889139.pdf
    • http://perpustakaan.ipts.ac.id/repository/how-to-hack-roblox-robux-no-download_GM431946152.pdf
    • http://perpustakaan.ipts.ac.id/repository/power-simulator-roblox-quest-cheats_GM431946152.pdf
    • http://perpustakaan.ipts.ac.id/repository/como-hackear-roblox-para-tener-robux-facil_GM431946152.pdf
    • http://perpustakaan.ipts.ac.id/repository/how-to-run-cheat-engine-with-roblox_GM431946152.pdf
    • http://perpustakaan.ipts.ac.id/repository/roblox-r-cheats-2021_GM431946152.pdf
    • http://perpustakaan.ipts.ac.id/repository/free-coins--spins-coin-master_GM406889139.pdf
    • http://perpustakaan.ipts.ac.id/repository/roblox-cp_GM431946152.pdf
    • http://perpustakaan.ipts.ac.id/repository/coin-master-cheat-free_GM406889139.pdf
    • http://perpustakaan.ipts.ac.id/repository/rich-free-roblox-accounts_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002b6d.bin
71159218a6c660c66cae056e447c2b6c139718d576aed5c9d05e03bea4340803		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2B6D 21136 bytes
font_01_sfnt_off0000595b.bin
6848d0416c88d6466013257ec1afc2d9b1286890084212ed34b88e8ce6d1bc44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x595B 19400 bytes

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