Malicious PDF — malware analysis report

Static analysis result for SHA-256 325b131542f6e6f9…

MALICIOUS

PDF

43.8 KB Created: 2021-05-14 14:43:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: faf8ef999d9cdef9a28659773b48d17e SHA-1: 9aa54db050659bd03d32b3575a2720bdf916132a SHA-256: 325b131542f6e6f9bc7e5aca0c7c09e6eec985c32528879faaad381576c3c617
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs and a 'download button' lure, strongly suggesting it is designed to redirect users to malicious websites. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, many with long, descriptive titles, pointing towards a link farm or SEO spam tactic to distribute malware. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.xyz/app/431946152/roblox-pink-free-robux-game-hack
    • https://gobeepbeep.co.uk/media/storage/editor/files/how-to-get-minecraft-for-free-on-android-device_GM479516143.pdf
    • https://gobeepbeep.co.uk/media/storage/editor/files/i-got-hacked-on-roblox_GM431946152.pdf
    • https://gobeepbeep.co.uk/media/storage/editor/files/hack-roblox-players_GM431946152.pdf
    • https://gobeepbeep.co.uk/media/storage/editor/files/free-robux-no-verification-no-download_GM431946152.pdf
    • https://gobeepbeep.co.uk/media/storage/editor/files/link-for-free-spins-on-coin-master_GM406889139.pdf
    • https://gobeepbeep.co.uk/media/storage/editor/files/how-to-hack-someones-roblox-account_GM431946152.pdf
    • https://gobeepbeep.co.uk/media/storage/editor/files/minecraft-gun-games-free_GM479516143.pdf
    • https://gobeepbeep.co.uk/media/storage/editor/files/coin-master-hack-apk-download-2021_GM406889139.pdf
    • https://gobeepbeep.co.uk/media/storage/editor/files/ways-to-get-free-robux_GM431946152.pdf
    • https://gobeepbeep.co.uk/media/storage/editor/files/how-to-get-creative-mode-in-minecraft-server-hack_GM479516143.pdf
    • https://gobeepbeep.co.uk/media/storage/editor/files/coin-master-free-coins-app_GM406889139.pdf
    • https://gobeepbeep.co.uk/media/storage/editor/files/easy-robux-today_GM431946152.pdf
    • https://gobeepbeep.co.uk/media/storage/editor/files/how-to-download-minecraft-java-edition-for-free_GM479516143.pdf
    • https://gobeepbeep.co.uk/media/storage/editor/files/coin-master-free-spin-app-reviews_GM406889139.pdf
    • https://gobeepbeep.co.uk/media/storage/editor/files/coin-master-free-spin-link-today-2021_GM406889139.pdf
    • https://gobeepbeep.co.uk/media/storage/editor/files/com-roblox_GM431946152.pdf
    • https://gobeepbeep.co.uk/media/storage/editor/files/free-robux-sites-that-work_GM431946152.pdf
    • https://gobeepbeep.co.uk/media/storage/editor/files/free-robux-no-human-verification-generator_GM431946152.pdf
    • https://gobeepbeep.co.uk/media/storage/editor/files/pro-free-spins-coin-master_GM406889139.pdf
    • https://gobeepbeep.co.uk/media/storage/editor/files/coin-master-connection-lost-hack_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004bc6.bin
df7c6363b45e43444578d9dd11ed9018e8635a73df5f7c141613207c240af2fe		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BC6 28056 bytes
font_01_sfnt_off00008861.bin
62e9169d40109a3abf4bdf842601a34c83c90693a7fee2a3f682a11a81f7ba3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8861 18532 bytes

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