Malicious PDF — malware analysis report

Static analysis result for SHA-256 458f2ea3da2a5f41…

MALICIOUS

PDF

52.0 KB Created: 2021-06-04 01:43:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: db56ba31f4df624e93fb4ad5cd1fb70d SHA-1: bdf6600b445994c5260eab734d4f35fe7b48d889 SHA-256: 458f2ea3da2a5f416dbc719063d72f88598ab7d20110fc3318c1c89eb2197b17
82 Risk Score

Malware Insights

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

The sample is a PDF document that displays a fake CAPTCHA or human verification prompt, a common lure to trick users into downloading further malicious content. The document contains an embedded URI pointing to a suspicious URL, which likely serves as the download source for a second-stage payload. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9657

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.online/app/431946152/microsoft-roblox-game-hack
    • http://library.fikes.upnvj.ac.id/repository/mcpe-116_GM479516143.pdf
    • http://library.fikes.upnvj.ac.id/repository/robuxy-com-free-robux_GM431946152.pdf
    • http://library.fikes.upnvj.ac.id/repository/free-400-spins-coin-master_GM406889139.pdf
    • http://library.fikes.upnvj.ac.id/repository/how-to-get-free-minecraft-windows-10_GM479516143.pdf
    • http://library.fikes.upnvj.ac.id/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdf
    • http://library.fikes.upnvj.ac.id/repository/free-roblox-hair-codes_GM431946152.pdf
    • http://library.fikes.upnvj.ac.id/repository/coin-master-free-coins-and-spins-2021_GM406889139.pdf
    • http://library.fikes.upnvj.ac.id/repository/do-robux-generators-work_GM431946152.pdf
    • http://library.fikes.upnvj.ac.id/repository/coin-master-daily-free-cards_GM406889139.pdf
    • http://library.fikes.upnvj.ac.id/repository/link-for-free-spins-on-coin-master_GM406889139.pdf
    • http://library.fikes.upnvj.ac.id/repository/how-to-host-a-minecraft-server-for-free_GM479516143.pdf
    • http://library.fikes.upnvj.ac.id/repository/minecraft-free-ios-2021_GM479516143.pdf
    • http://library.fikes.upnvj.ac.id/repository/how-to-get-free-robux-without-doing-anything_GM431946152.pdf
    • http://library.fikes.upnvj.ac.id/repository/free-robux-without-any-verification_GM431946152.pdf
    • http://library.fikes.upnvj.ac.id/repository/can-u-get-free-robux_GM431946152.pdf
    • http://library.fikes.upnvj.ac.id/repository/coin-master-gift-link_GM406889139.pdf
    • http://library.fikes.upnvj.ac.id/repository/how-to-get-minecraft-realms-for-free_GM479516143.pdf
    • http://library.fikes.upnvj.ac.id/repository/roblox-royale-high-diamond-hack_GM431946152.pdf
    • http://library.fikes.upnvj.ac.id/repository/unlimited-coin-master-free-spins_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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051ee.bin
2262c966f1cb37dbfa3ae5073e342acc0df13d6797ee0a5a502b9f5cd797487b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51EE 28132 bytes
font_01_sfnt_off00009185.bin
680cee9962ed9b8340f32eb4497b4a869b674082cb72c24c089fa73c4597fa7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9185 2880 bytes
font_02_sfnt_off00009b56.bin
450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B56 5696 bytes
font_03_sfnt_off0000a868.bin
2b7eeff572d04ab457d9e2a35520a79c61ee30861b9713b02bf411d46f2ac039		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA868 18204 bytes

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