Malicious PDF — malware analysis report

Static analysis result for SHA-256 da066856927194fc…

MALICIOUS

PDF

33.8 KB Created: 2021-07-03 23:46:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 6e609e9ee7bb136fa2d44bdfed9adf3f SHA-1: 550f60002c710ce26bb386640617404bcba082d4 SHA-256: da066856927194fc843d13b1a4cf3df28da01d1fd1e01fc9d87451d6a1bc22f2
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on suspicious domains and promise free Robux or game hacks. The heuristic 'SE_LOLBIN_RUN_COMMAND' suggests that the document may attempt to execute commands, likely to download and run a second-stage payload from one of the embedded URLs. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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-group-game-hack
    • http://perpustakaan.pa-jember.go.id/repository/robux-gratis-sin-hacks-2021_GM431946152.pdf
    • http://perpustakaan.pa-jember.go.id/repository/how-to-get-free-robux-for-free_GM431946152.pdf
    • http://perpustakaan.pa-jember.go.id/repository/roblox-free-templste-stream_GM431946152.pdf
    • http://perpustakaan.pa-jember.go.id/repository/free-admin-roblox-map_GM431946152.pdf
    • http://perpustakaan.pa-jember.go.id/repository/coin-master-free-spins-generator-no-verification_GM406889139.pdf
    • http://perpustakaan.pa-jember.go.id/repository/free-robux-gift-catd-codes-list_GM431946152.pdf
    • http://perpustakaan.pa-jember.go.id/repository/how-to-look-like-a-hacker-in-roblox-with-rubux_GM431946152.pdf
    • http://perpustakaan.pa-jember.go.id/repository/how-to-hack-peoples-account-in-roblox_GM431946152.pdf
    • http://perpustakaan.pa-jember.go.id/repository/how-to-get-free-robux-fast_GM431946152.pdf
    • http://perpustakaan.pa-jember.go.id/repository/e-free-roblox_GM431946152.pdf
    • http://perpustakaan.pa-jember.go.id/repository/how-to-get-a-free-server-on-roblox_GM431946152.pdf
    • http://perpustakaan.pa-jember.go.id/repository/how-to-hack-roblox-robux-with-cmd_GM431946152.pdf
    • http://perpustakaan.pa-jember.go.id/repository/roblox-apocalypse-rising-hack-download_GM431946152.pdf
    • http://perpustakaan.pa-jember.go.id/repository/free-coins-on-coin-master-2021_GM406889139.pdf
    • http://perpustakaan.pa-jember.go.id/repository/but-link-says-free-robux_GM431946152.pdf
    • http://perpustakaan.pa-jember.go.id/repository/how-to-get-free-instant-robux-no-inspect-element-proof_GM431946152.pdf
    • http://perpustakaan.pa-jember.go.id/repository/coin-master-free-spins-link-today-facebook_GM406889139.pdf
    • http://perpustakaan.pa-jember.go.id/repository/el-mejor-hack-para-roblox_GM431946152.pdf
    • http://perpustakaan.pa-jember.go.id/repository/roblox-flame-exploit-free_GM431946152.pdf
    • http://perpustakaan.pa-jember.go.id/repository/wwwroblox-hack-get-free-robux_GM431946152.pdf
    • http://perpustakaan.pa-jember.go.id/repo
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002eb8.bin
28f3c31a15acf601e779df45eb793fa850b4395e70d7111b4545c9876352b3f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2EB8 22040 bytes
font_01_sfnt_off00005f4f.bin
67507f51078b9d360364fd80bede771b0831b8cadce387b59c9348d966d9fcb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F4F 18892 bytes

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