Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f814cf5902b735d…

MALICIOUS

PDF

46.0 KB Created: 2021-06-11 01:39:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4520c5ad76b7880a42ec7eb40e268c95 SHA-1: d0ccc94fd77c3e32edd6708b8ec71d7872ad726f SHA-256: 8f814cf5902b735d2b965a55d94e8843403e1a5353596cd54bb973c1083b23d8
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links to external websites, many of which are structured as SEO link farms for popular games. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to direct users to potentially harmful content. While no scripts were directly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.tw/app/431946152/google-only-roblox-items-free-2021-game-hack
    • http://perpustakaan.iahntp.ac.id/repository/10-robux_GM431946152.pdf
    • http://perpustakaan.iahntp.ac.id/repository/roblox-download_GM431946152.pdf
    • http://perpustakaan.iahntp.ac.id/repository/how-to-play-minecraft-for-free-on-pc_GM479516143.pdf
    • https://perpustakaan.iahntp.ac.id/repository/is-minecraft-free-on-ps4_GM479516143.pdf
    • http://perpustakaan.iahntp.ac.id/repository/coin-master-spin-ml-link_GM406889139.pdf
    • http://perpustakaan.iahntp.ac.id/repository/coin-master-free-spins-a2z-help_GM406889139.pdf
    • http://perpustakaan.iahntp.ac.id/repository/coin-master-free-spins-cheat-deutsch_GM406889139.pdf
    • http://perpustakaan.iahntp.ac.id/repository/coin-master-hack-tool-no-human-verification_GM406889139.pdf
    • http://perpustakaan.iahntp.ac.id/repository/get-free-robux-no-human-verification_GM431946152.pdf
    • https://perpustakaan.iahntp.ac.id/repository/copy-and-paste-for-free-roblox-clothes_GM431946152.pdf
    • http://perpustakaan.iahntp.ac.id/repository/best-way-to-hack-coin-master_GM406889139.pdf
    • http://perpustakaan.iahntp.ac.id/repository/2021-free-robux-daily-website_GM431946152.pdf
    • http://perpustakaan.iahntp.ac.id/repository/freecoins_GM406889139.pdf
    • http://perpustakaan.iahntp.ac.id/repository/roblox-how-to-make-a-anti-cheat-system_GM431946152.pdf
    • http://perpustakaan.iahntp.ac.id/repository/hacked-roblox-game_GM431946152.pdf
    • http://perpustakaan.iahntp.ac.id/repository/coin-master-free-spin-group_GM406889139.pdf
    • http://perpustakaan.iahntp.ac.id/repository/how-to-get-free-robux-generator_GM431946152.pdf
    • http://perpustakaan.iahntp.ac.id/repository/coin-master-fun-free-spins_GM406889139.pdf
    • http://perpustakaan.iahntp.ac.id/repository/free-robux-no-human-verification-or-survey_GM431946152.pdf
    • http://perpustakaan.iahntp.ac.id/repository/how-to-get-free-minecraft-windows-10_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000053b6.bin
aabccd212661bd330724e86245e480053e80cccad4df4c19df4f826979b20fb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53B6 25436 bytes
font_01_sfnt_off00008e5e.bin
07b56925c608d00e4b37c5a83e498f8f5980bd002984b482121057605ab6985b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E5E 19184 bytes

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