Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c6cf71daf03f1f…

MALICIOUS

PDF

49.1 KB Created: 2021-06-09 04:57:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6005eba1f393f4e972580c5bcbd99902 SHA-1: ab355a31e722b1668ecf0bdc3097ddd763ab4048 SHA-256: 31c6cf71daf03f1fad2c8c3e3879e6b8d52dc33f09afa8a54afed3492e20c288
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document displays a fake CAPTCHA lure, encouraging users to click on embedded links. These links, such as 'https://netcdn.tw/app/431946152/roblox-wizard-pants-free-game-hack', likely lead to the download of malicious content or further exploitation. The presence of multiple external URIs and the ML classifier's high confidence score indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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.tw/app/431946152/roblox-wizard-pants-free-game-hack PDF link annotation
    • http://digilib.iailm.ac.id/repository/free-minecraft-texture-packs-java_GM479516143.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/hack-coin-master-game-apk-download_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/free-roblox-clothes-templates_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/hack-master-coin_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/ro-ghoul-script_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/minecraft-ios-mods_GM479516143.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/how-to-get-free-coins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/synapse-roblox-free-download_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/free-pet-food-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/how-to-hack-people-in-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/minecraft-pe-hacks-ios_GM479516143.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/roblox-hackers-list_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/coin-master-free-spins-cheat-codes_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/pubg-uc-kr-version_GM1330123889.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B18 29036 bytes
SHA-256: a8de5690504eafaf1965ff96a83bfd4e266957682366ca234253b42ee6347029
font_01_sfnt_off00009b8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B8B 19008 bytes
SHA-256: 9f597a7b1641d10c90a1841f8022904596448be4e94e963bf8d34dc1b413f772

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