Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e25d1327e7346f…

MALICIOUS

PDF

48.2 KB Created: 2021-06-11 08:06:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: ca0592520664ba14b69e2b27becd02ef SHA-1: 936f82588304d5c37f247823d4df22fd94ca395d SHA-256: a4e25d1327e7346fb3af595785d3f6072f3007a61a84370522a30f90583b8a0c
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is designed as a lure, using the guise of offering free Robux for the Roblox game to trick users. It contains a large number of external links, forming a link farm, with the primary URL pointing to a suspicious domain. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/roblox-catalog-free-robux-game-hack
    • http://perpustakaan.idia.ac.id/repository/free-robux-without-human-verification-real_GM431946152.pdf
    • http://perpustakaan.idia.ac.id/repository/can-you-get-robux-for-free_GM431946152.pdf
    • http://perpustakaan.idia.ac.id/repository/coin-master-el-tiger-card-free_GM406889139.pdf
    • http://perpustakaan.idia.ac.id/repository/how-to-get-minecraft-on-chromebook-for-free_GM479516143.pdf
    • http://perpustakaan.idia.ac.id/repository/free-printable-minecraft-coloring-pages_GM479516143.pdf
    • http://perpustakaan.idia.ac.id/repository/how-to-get-free-robux-without-email_GM431946152.pdf
    • http://perpustakaan.idia.ac.id/repository/como-hackear-el-juego-coin-master_GM406889139.pdf
    • http://perpustakaan.idia.ac.id/repository/picture-roblox_GM431946152.pdf
    • http://perpustakaan.idia.ac.id/repository/download-game-roblox-pc-free_GM431946152.pdf
    • http://perpustakaan.idia.ac.id/repository/roblox-hackprogamers-com_GM431946152.pdf
    • http://perpustakaan.idia.ac.id/repository/how-to-get-free-minecraft-skins_GM479516143.pdf
    • http://perpustakaan.idia.ac.id/repository/coin-master-free-spins-16-04-19_GM406889139.pdf
    • http://perpustakaan.idia.ac.id/repository/coin-master-free-spins-2021-today_GM406889139.pdf
    • http://perpustakaan.idia.ac.id/repository/robux-free-gift-card-org-hack_GM431946152.pdf
    • http://perpustakaan.idia.ac.id/repository/get-free-robux-without-human-verification_GM431946152.pdf
    • http://perpustakaan.idia.ac.id/repository/how-to-get-minecoins-in-minecraft-for-free_GM479516143.pdf
    • http://perpustakaan.idia.ac.id/repository/robux-generator_GM431946152.pdf
    • http://perpustakaan.idia.ac.id/repository/free-coins-and-spins-link-for-coin-master_GM406889139.pdf
    • http://perpustakaan.idia.ac.id/repository/robux-com-free-robux_GM431946152.pdf
    • http://perpustakaan.idia.ac.id/repository/www-free-robux-win_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000517d.bin
e90fff2cec7106b9d1c8dc2586ed69a18bcc1366254d570727598c92b61083db		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x517D 25048 bytes
font_01_sfnt_off00008b71.bin
40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B71 3884 bytes
font_02_sfnt_off00009819.bin
a47db2d7fc94ee015af24b357575a873422fa83d2bdf4d13a18d3ed2bd549d92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9819 18708 bytes

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