Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4cefc322ee01a55…

MALICIOUS

PDF

45.8 KB Created: 2021-05-12 15:36:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: b43cf25c3809288ebbc17856a7c93f79 SHA-1: 92367a3c4445734027f6118518cc7efbb45cc11a SHA-256: b4cefc322ee01a553ed975453002317ab162bcaf733f9013ebf9e9a144a5e31e
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure to trick users into interacting with embedded links, which likely leads to the download of a second-stage payload. The presence of multiple URLs pointing to game-related hacks suggests a social engineering tactic to entice users. No scripts were extracted, but the ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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/roblox-free-clothes-girl-game-hack
    • https://elearning.man5kediri.sch.id/__statics/gudangsoal/files/coin-master-hack-spins-and-coins-unlimited-free-download_GM406889139.pdf
    • https://elearning.man5kediri.sch.id/__statics/gudangsoal/files/minecraft-free-download_GM479516143.pdf
    • https://elearning.man5kediri.sch.id/__statics/gudangsoal/files/free-coins-and-spins-coin-master-2021_GM406889139.pdf
    • https://elearning.man5kediri.sch.id/__statics/gudangsoal/files/free-spins-coin-master-blogspot_GM406889139.pdf
    • https://elearning.man5kediri.sch.id/__statics/gudangsoal/files/50-free-spins-coin-master_GM406889139.pdf
    • https://elearning.man5kediri.sch.id/__statics/gudangsoal/files/roblox40com-robux_GM431946152.pdf
    • https://elearning.man5kediri.sch.id/__statics/gudangsoal/files/promo-codes-for-free-robux_GM431946152.pdf
    • https://elearning.man5kediri.sch.id/__statics/gudangsoal/files/hacked-roblox-accounts-list_GM431946152.pdf
    • https://elearning.man5kediri.sch.id/__statics/gudangsoal/files/how-can-i-get-free-spins-on-coin-master_GM406889139.pdf
    • https://elearning.man5kediri.sch.id/__statics/gudangsoal/files/free-robux-hack-us_GM431946152.pdf
    • https://elearning.man5kediri.sch.id/__statics/gudangsoal/files/sb-game-hacker-coin-master_GM406889139.pdf
    • https://elearning.man5kediri.sch.id/__statics/gudangsoal/files/free-robux-games-on-roblox_GM431946152.pdf
    • https://elearning.man5kediri.sch.id/__statics/gudangsoal/files/roblox-robux-hack-generator_GM431946152.pdf
    • https://elearning.man5kediri.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-for-free_GM431946152.pdf
    • https://elearning.man5kediri.sch.id/__statics/gudangsoal/files/roblox-script-hacks_GM431946152.pdf
    • https://elearning.man5kediri.sch.id/__statics/gudangsoal/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdf
    • https://elearning.man5kediri.sch.id/__statics/gudangsoal/files/free-robux-no-survey-or-human-verification_GM431946152.pdf
    • https://elearning.man5kediri.sch.id/__statics/gudangsoal/files/300-free-spins-coin-master_GM406889139.pdf
    • https://elearning.man5kediri.sch.id/__statics/gudangsoal/files/coin-master-hack-injection_GM406889139.pdf
    • https://elearning.man5kediri.sch.id/__statics/gudangsoal/files/how-to-get-free-mods-in-minecraft_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d3b.bin
cd68faa15397611deacde98f2867aaa6c3cefbca5c2148e78e19313e561a78d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D3B 24756 bytes
font_01_sfnt_off0000868b.bin
e28d2c57f35643e2026f86c34ac3bb63cba74be3f6c066e81aba6d285e5a121b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x868B 2908 bytes
font_02_sfnt_off00009085.bin
43b97e088e2ffab0722e8ce3b94223e5cd299235dccb62a3edb2f682d17634b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9085 18340 bytes

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