Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b0409f28166eb77…

MALICIOUS

PDF

36.6 KB Created: 2021-07-03 17:53:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: ad6100d5395e7dc09852093499929b7d SHA-1: e320c40048c3c7c46695e4d4c9778ef594d0c609 SHA-256: 3b0409f28166eb77f7796fb887fbcc54f5527b8808ab9be9e0fee1cee5c3e306
102 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are related to 'free Robux' or game cheats, indicating a likely phishing or scam attempt. The heuristic 'PDF_SEO_LINK_FARM' suggests a large number of these links are generated to appear as legitimate content, further supporting a malicious intent. 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.tw/app/431946152/free-robux-no-human-verification-no-app-download-game-hack
    • http://pustaka.ditjenpkh.pertanian.go.id/pusvetma/repository/roblox-free-t-shirt-template_GM431946152.pdf
    • http://pustaka.ditjenpkh.pertanian.go.id/pusvetma/repository/robux-get-com_GM431946152.pdf
    • http://pustaka.ditjenpkh.pertanian.go.id/pusvetma/repository/is-it-cheating-to-use-a-autoclicker-in-roblox_GM431946152.pdf
    • http://pustaka.ditjenpkh.pertanian.go.id/pusvetma/repository/coin-master-link-for-spins_GM406889139.pdf
    • http://pustaka.ditjenpkh.pertanian.go.id/pusvetma/repository/how-to-have-a-gun-on-my-character-free-roblox_GM431946152.pdf
    • http://pustaka.ditjenpkh.pertanian.go.id/pusvetma/repository/como-sacar-buen-puntaje-en-juego-coin-master-free-spins_GM406889139.pdf
    • http://pustaka.ditjenpkh.pertanian.go.id/pusvetma/repository/free-robux-script-pastebin-instent-in-promo-code_GM431946152.pdf
    • http://pustaka.ditjenpkh.pertanian.go.id/pusvetma/repository/roblox-fashion-famous-free-game_GM431946152.pdf
    • http://pustaka.ditjenpkh.pertanian.go.id/pusvetma/repository/free-robux-codes-2021-real_GM431946152.pdf
    • http://pustaka.ditjenpkh.pertanian.go.id/pusvetma/repository/free-robux-pin-codes-2021_GM431946152.pdf
    • http://pustaka.ditjenpkh.pertanian.go.id/pusvetma/repository/can-you-get-free-robux-on-roblox_GM431946152.pdf
    • http://pustaka.ditjenpkh.pertanian.go.id/pusvetma/repository/coin-master-rewards-free-spins_GM406889139.pdf
    • http://pustaka.ditjenpkh.pertanian.go.id/pusvetma/repository/dragon-ball-rage-cheats-roblox_GM431946152.pdf
    • http://pustaka.ditjenpkh.pertanian.go.id/pusvetma/repository/how-to-hack-into-an-account-on-roblox_GM431946152.pdf
    • http://pustaka.ditjenpkh.pertanian.go.id/pusvetma/repository/how-to-get-free-roblox-card-codes-hack_GM431946152.pdf
    • http://pustaka.ditjenpkh.pertanian.go.id/pusvetma/repository/how-to-get-free-robux-hacks-online_GM431946152.pdf
    • http://pustaka.ditjenpkh.pertanian.go.id/pusvetma/repository/roblox-donegon-quest-level-hack_GM431946152.pdf
    • http://pustaka.ditjenpkh.pertanian.go.id/pusvetma/repository/free-limited-roblox-items_GM431946152.pdf
    • http://pustaka.ditjenpkh.pertanian.go.id/pusvetma/repository/haw-to-get-free-dominus-on-roblox-2021-march_GM431946152.pdf
    • http://pustaka.ditjenpkh.pertanian.go.id/pusvetma/repository/free-roblox-chromebook-codes_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000033ec.bin
78ce2ac95b3950ff4e8bff6631c56137e2de3f56479b8a9aeff6c47023c46815		 pdf-font-stream PDF embedded font (sfnt) at offset 0x33EC 22988 bytes
font_01_sfnt_off000067af.bin
571eccaebfecfca2aff2922213bb611c91b8320c64547ca3b0bcf126f3ba95df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67AF 19904 bytes

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