Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b5aeb04c559f887…

MALICIOUS

PDF

32.9 KB Created: 2021-07-05 16:57:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 157464d87e49016fb6b21d45784b4842 SHA-1: 5289d0b87610c786ec240c6e3dc7385b20e4d7ca SHA-256: 1b5aeb04c559f887d2787a9c4d395bdcc3ebfd5c7c47d755dc0966997e39eebe
102 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links, many of which are part of a link farm designed to appear as SEO content. The primary URL, http://netcdn.tw/app/406889139/coin-master-free-game-hack, and many others point to resources promising free in-game items or cheats for popular games. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful sites or initiate downloads.

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/406889139/coin-master-free-game-hack
    • http://perpustakaan.pa-jember.go.id/repository/juego-de-roblox-hecho-por-un-hacker_GM431946152.pdf
    • http://perpustakaan.pa-jember.go.id/repository/get-free-robux-pastebincom_GM431946152.pdf
    • http://perpustakaan.pa-jember.go.id/repository/roblox-games-that-have-free-radio_GM431946152.pdf
    • http://perpustakaan.pa-jember.go.id/repository/free-robux-working_GM431946152.pdf
    • http://perpustakaan.pa-jember.go.id/repository/how-to-get-free-gamepasses-on-roblox_GM431946152.pdf
    • http://perpustakaan.pa-jember.go.id/repository/roblox-skin-free_GM431946152.pdf
    • http://perpustakaan.pa-jember.go.id/repository/how-to-speed-hack-roblox-cheat-engine_GM431946152.pdf
    • http://perpustakaan.pa-jember.go.id/repository/hacks-to-get-free-robux_GM431946152.pdf
    • http://perpustakaan.pa-jember.go.id/repository/roblox-mad-city-level-100-hack_GM431946152.pdf
    • http://perpustakaan.pa-jember.go.id/repository/robux-free-gift-card-org-hack_GM431946152.pdf
    • http://perpustakaan.pa-jember.go.id/repository/free-roblox-robux-gift-card-codes_GM431946152.pdf
    • http://perpustakaan.pa-jember.go.id/repository/free-coin-master-spins-2021-link_GM406889139.pdf
    • http://perpustakaan.pa-jember.go.id/repository/how-to-make-a-roblox-group-for-free_GM431946152.pdf
    • http://perpustakaan.pa-jember.go.id/repository/free-roblox-com_GM431946152.pdf
    • http://perpustakaan.pa-jember.go.id/repository/como-volar-facil-sin-hackear-en-un-juego-de-roblox_GM431946152.pdf
    • http://perpustakaan.pa-jember.go.id/repository/how-to-get-robux-for-free-hack-2021_GM431946152.pdf
    • http://perpustakaan.pa-jember.go.id/repository/roblox-giant-hand-hack_GM431946152.pdf
    • http://perpustakaan.pa-jember.go.id/repository/roblox-project-pokemon-hack_GM431946152.pdf
    • http://perpustakaan.pa-jember.go.id/repository/how-to-exploit-yoru-on-roblox-with-cheat-engine_GM431946152.pdf
    • http://perpustakaan.pa-jember.go.id/repository/free-robux-apps-that-actually-work_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00002d06.bin
ebd8b35ac889e78103f5159e167a804c39672f1359d599af3e5112fd3e0a3b64		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2D06 22444 bytes
font_01_sfnt_off00005eb1.bin
2ec206c530faa3d40eac36f14655b3e9b935e9ff12c648634e177d5bc9421463		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EB1 17996 bytes

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