Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6bfaf07c0ff0e53…

MALICIOUS

PDF

35.2 KB Created: 2021-07-04 21:01:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: d24e45cb577fd533abe9ae4d58dfd941 SHA-1: 6b444e4c510a601cdeb559edfb8698bc9cf030ba SHA-256: c6bfaf07c0ff0e5305b3b5092ef97219962039e794b147121c8cd1a36952a2ac
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and a document body that promotes free in-game currency and hacks for popular games. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm designed to attract users. The ML classifier also flagged this PDF as malicious. While no scripts were directly extracted, the presence of numerous links to external resources, some of which are hosted on suspicious domains, strongly suggests a phishing or malware distribution attempt.

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/free-robux-without-doing-anything-game-hack
    • http://perpustakaan.stikim.ac.id/slims/repository/how-to-get-free-roebucks-on-roblox_GM431946152.pdf
    • http://perpustakaan.stikim.ac.id/slims/repository/how-to-get-free-robux-computer-hack_GM431946152.pdf
    • http://perpustakaan.stikim.ac.id/slims/repository/how-to-get-free-minecraft-skins_GM479516143.pdf
    • http://perpustakaan.stikim.ac.id/slims/repository/coin-master-free-spins_GM406889139.pdf
    • http://perpustakaan.stikim.ac.id/slims/repository/how-i-can-get-free-robux_GM431946152.pdf
    • http://perpustakaan.stikim.ac.id/slims/repository/roblox-blockburg-money-hack-penquin-gui-script_GM431946152.pdf
    • http://perpustakaan.stikim.ac.id/slims/repository/free-robux-in-roblox-real_GM431946152.pdf
    • http://perpustakaan.stikim.ac.id/slims/repository/free-robux-promo-codes-2021-november_GM431946152.pdf
    • http://perpustakaan.stikim.ac.id/slims/repository/robux-codes-generator-no-human-verification_GM431946152.pdf
    • http://perpustakaan.stikim.ac.id/slims/repository/how-to-hack-into-builders-club-on-roblox_GM431946152.pdf
    • http://perpustakaan.stikim.ac.id/slims/repository/free-spin-link-coin-master-today_GM406889139.pdf
    • http://perpustakaan.stikim.ac.id/slims/repository/free-robux-codes-no-builders-club_GM431946152.pdf
    • http://perpustakaan.stikim.ac.id/slims/repository/free-robux-for-free_GM431946152.pdf
    • http://perpustakaan.stikim.ac.id/slims/repository/cool-free-minecraft-skins_GM479516143.pdf
    • http://perpustakaan.stikim.ac.id/slims/repository/free-spins-and-coins-coin-master-2021-link_GM406889139.pdf
    • http://perpustakaan.stikim.ac.id/slims/repository/minecraft-build-hacks_GM479516143.pdf
    • http://perpustakaan.stikim.ac.id/slims/repository/free-minecraft-account-and-password-2021_GM479516143.pdf
    • http://perpustakaan.stikim.ac.id/slims/repository/free-spin-gratis-coin-master_GM406889139.pdf
    • http://perpustakaan.stikim.ac.id/slims/repository/how-to-get-free-robux-2021-envix_GM431946152.pdf
    • http://perpustakaan.stikim.ac.id/slims/repository/free-roblox-books_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003189.bin
759b654c56b776c404a3c9d89619b989d379f80d195e6ce944b6b8aa344dfe1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3189 22180 bytes
font_01_sfnt_off0000629f.bin
175c8a58e8e169f12273aafb2eda495858213246dee116a0d68e3e1da0577e93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x629F 19652 bytes

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