Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f8c3911526d7eaa…

MALICIOUS

PDF

42.5 KB Created: 2021-05-12 22:48:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: eec4483a2ff4789ee467fb8ce86b7d29 SHA-1: b3ee89b5820a969c6b4d50deafa3b759c9592585 SHA-256: 2f8c3911526d7eaab6022becab86597ecdbb062fc4067b819918f59b9623c07e
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The document presents a fake CAPTCHA to trick users into downloading a payload from the URL https://netcdn.xyz/app/431946152/freerubux-game-hack. The presence of multiple URLs related to game hacks and free currency suggests a social engineering lure for malware distribution. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.xyz/app/431946152/freerubux-game-hack
    • http://elearningma.darmuj.sch.id/__statics/gudangsoal/files/coin-master-spin-pattern_GM406889139.pdf
    • http://elearningma.darmuj.sch.id/__statics/gudangsoal/files/spin-and-coin-link_GM406889139.pdf
    • http://elearningma.darmuj.sch.id/__statics/gudangsoal/files/robuxmatch-com-free-robux_GM431946152.pdf
    • http://elearningma.darmuj.sch.id/__statics/gudangsoal/files/make-free-robux_GM431946152.pdf
    • http://elearningma.darmuj.sch.id/__statics/gudangsoal/files/appsmobinfo-coinmasterhack-coin-master-hack_GM406889139.pdf
    • http://elearningma.darmuj.sch.id/__statics/gudangsoal/files/hack-coin-master-for-free_GM406889139.pdf
    • http://elearningma.darmuj.sch.id/__statics/gudangsoal/files/free-game-pack-with-google-play-coin-master_GM406889139.pdf
    • http://elearningma.darmuj.sch.id/__statics/gudangsoal/files/coin-master-free-stuff_GM406889139.pdf
    • http://elearningma.darmuj.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-without-verification_GM431946152.pdf
    • http://elearningma.darmuj.sch.id/__statics/gudangsoal/files/how-to-hack-someones-account-on-roblox_GM431946152.pdf
    • http://elearningma.darmuj.sch.id/__statics/gudangsoal/files/free-robux-no-verification-2021_GM431946152.pdf
    • http://elearningma.darmuj.sch.id/__statics/gudangsoal/files/roblox-free-bundles_GM431946152.pdf
    • http://elearningma.darmuj.sch.id/__statics/gudangsoal/files/roblox-redeem-robux_GM431946152.pdf
    • http://elearningma.darmuj.sch.id/__statics/gudangsoal/files/coin-master-unlimited-spin-hack_GM406889139.pdf
    • http://elearningma.darmuj.sch.id/__statics/gudangsoal/files/free-coins-on-coin-master-without-verification_GM406889139.pdf
    • http://elearningma.darmuj.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-2021_GM431946152.pdf
    • http://elearningma.darmuj.sch.id/__statics/gudangsoal/files/coin-master-apk_GM406889139.pdf
    • http://elearningma.darmuj.sch.id/__statics/gudangsoal/files/cute-free-roblox-outfits_GM431946152.pdf
    • http://elearningma.darmuj.sch.id/__statics/gudangsoal/files/free-robux-hack-generator_GM431946152.pdf
    • http://elearningma.darmuj.sch.id/__statics/gudangsoal/files/free-spin-online-tool-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000049f7.bin
9a5c874e536ee395855ff0d9e17ce27b3042f5384eef9146c73e0d8cae53ec7f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49F7 26064 bytes
font_01_sfnt_off000084fd.bin
f4416bbc5f287efcbe31c7b4c704cc92a0ced0ddcdd2f5cfb5fb7d41fdf7fc1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84FD 17872 bytes

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