Malicious PDF — malware analysis report

Static analysis result for SHA-256 b15a37e6a8c4df37…

MALICIOUS

PDF

45.0 KB Created: 2021-06-09 03:30:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 96ebd9f0025a61d3a87cc309bba5ca19 SHA-1: 14dd28aee46934c39b3fedc5b1325c5c8d7d7884 SHA-256: b15a37e6a8c4df3717fd134f50d1d8688478260c0bf061871151dee9a2e37268
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document uses a lure related to obtaining free Robux, a virtual currency in the Roblox game, to entice users. It contains embedded URLs pointing to external resources, likely intended to host or redirect to malicious payloads. The presence of a password archive lure suggests an attempt to bypass security controls by encrypting the actual malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/how-do-u-get-free-robux-on-roblox-2021-game-hack
    • http://library.fikes.upnvj.ac.id/repository/hack-coin-master-no-survey_GM406889139.pdf
    • http://library.fikes.upnvj.ac.id/repository/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdf
    • http://library.fikes.upnvj.ac.id/repository/obby-gives-you-free-robux-no-password_GM431946152.pdf
    • http://library.fikes.upnvj.ac.id/repository/www-coin-master-hack_GM406889139.pdf
    • http://library.fikes.upnvj.ac.id/repository/2021-how-to-make-a-free-group-in-roblox_GM431946152.pdf
    • http://library.fikes.upnvj.ac.id/repository/free-robux-master_GM431946152.pdf
    • http://library.fikes.upnvj.ac.id/repository/hacks-for-roblox-prison-life_GM431946152.pdf
    • http://library.fikes.upnvj.ac.id/repository/how-to-get-free-robux-inspect_GM431946152.pdf
    • http://library.fikes.upnvj.ac.id/repository/wurst-hacked-client-112-2_GM479516143.pdf
    • http://library.fikes.upnvj.ac.id/repository/roblox-robux-generator-tool_GM431946152.pdf
    • http://library.fikes.upnvj.ac.id/repository/is-there-a-way-to-get-free-robux_GM431946152.pdf
    • http://library.fikes.upnvj.ac.id/repository/coin-master-spin-hack-without-verification_GM406889139.pdf
    • http://library.fikes.upnvj.ac.id/repository/roblox-free-800-robux_GM431946152.pdf
    • http://library.fikes.upnvj.ac.id/repository/minecraft-bedrock-client_GM479516143.pdf
    • http://library.fikes.upnvj.ac.id/repository/if-you-delete-minecraft-can-you-redownload-it-for-free_GM479516143.pdf
    • http://library.fikes.upnvj.ac.id/repository/how-to-get-minecraft-windows-10-for-free-with-java_GM479516143.pdf
    • http://library.fikes.upnvj.ac.id/repository/free-robux-only-1-step_GM431946152.pdf
    • http://library.fikes.upnvj.ac.id/repository/roblox-robux-hack-generator_GM431946152.pdf
    • http://library.fikes.upnvj.ac.id/repository/coin-master-gift-hack_GM406889139.pdf
    • http://library.fikes.upnvj.ac.id/repository/free-spin-link-coin-master-today_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051dd.bin
a35f5b08aea6a8c6f6a15a910dead6787b3db3e570e6d501f4c39d3106faed0a		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51DD 24920 bytes
font_01_sfnt_off00008ab4.bin
c0854e00225ff777290c8fad2d5e2698e06201b7d076ada94afc712e03a5f3ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AB4 19112 bytes

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