Malicious PDF — malware analysis report

Static analysis result for SHA-256 128373c18dfcd4fe…

MALICIOUS

PDF

45.3 KB Created: 2021-06-09 01:32:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 2e41c1a9ccf76cf55db29fee546542d0 SHA-1: 270c7dad23ad623d25ea7748b6cbc28eea00c876 SHA-256: 128373c18dfcd4fe9ee8d5af260c28a5c50ce73a4dd016f61586a21d9609f32c
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The document displays a fake CAPTCHA to trick the user into interacting with a malicious link, likely leading to a second-stage download. The ML classifier strongly flagged this PDF as malicious. The presence of multiple URLs associated with game hacks suggests a lure for potentially younger users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/free-roblox-codes-2021-game-hack
    • https://meerdanverzekeren.nl/wp-content/uploads/fsqm-files/hacker-avatar-roblox_GM431946152.pdf
    • https://meerdanverzekeren.nl/wp-content/uploads/fsqm-files/how-to-hack-roblox-high-school-with-cheat-engine_GM431946152.pdf
    • https://meerdanverzekeren.nl/wp-content/uploads/fsqm-files/hack-tiktok-fans-free_GM835599320.pdf
    • https://meerdanverzekeren.nl/wp-content/uploads/fsqm-files/apk-roblox-hack-2021_GM431946152.pdf
    • https://meerdanverzekeren.nl/wp-content/uploads/fsqm-files/robux-free-online_GM431946152.pdf
    • https://meerdanverzekeren.nl/wp-content/uploads/fsqm-files/roblox-arsenal-hacks-mobile_GM431946152.pdf
    • https://meerdanverzekeren.nl/wp-content/uploads/fsqm-files/minecraft-realms-free-codes_GM479516143.pdf
    • https://meerdanverzekeren.nl/wp-content/uploads/fsqm-files/free-minecraft-hosting_GM479516143.pdf
    • https://meerdanverzekeren.nl/wp-content/uploads/fsqm-files/free-robux-pro_GM431946152.pdf
    • https://meerdanverzekeren.nl/wp-content/uploads/fsqm-files/minecraft-iphone-free_GM479516143.pdf
    • https://meerdanverzekeren.nl/wp-content/uploads/fsqm-files/how-to-hack-bloxburg-roblox-2021_GM431946152.pdf
    • https://meerdanverzekeren.nl/wp-content/uploads/fsqm-files/free-robux-pastebin-no-wait-2021-may_GM431946152.pdf
    • https://meerdanverzekeren.nl/wp-content/uploads/fsqm-files/how-to-get-minecraft-for-free-on-xbox-one_GM479516143.pdf
    • https://meerdanverzekeren.nl/wp-content/uploads/fsqm-files/hack-adopt-me-roblox-2021_GM431946152.pdf
    • https://meerdanverzekeren.nl/wp-content/uploads/fsqm-files/how-to-get-free-roblox-clothes-no-bc_GM431946152.pdf
    • https://meerdanverzekeren.nl/wp-content/uploads/fsqm-files/claim-free-robux_GM431946152.pdf
    • https://meerdanverzekeren.nl/wp-content/uploads/fsqm-files/huskybuckscom-free-robux_GM431946152.pdf
    • https://meerdanverzekeren.nl/wp-content/uploads/fsqm-files/blueberry-hack-roblox-jailbreak_GM431946152.pdf
    • https://meerdanverzekeren.nl/wp-content/uploads/fsqm-files/cheating-story-in-roblox_GM431946152.pdf
    • https://meerdanverzekeren.nl/wp-content/uploads/fsqm-files/roblox-free-clothes-boy_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000536b.bin
cb4a5d57662a8ef94d167919e0f9e7e1a79893240330113c29902785fbd8f21f
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x536B 25556 bytes
font_01_sfnt_off00008dcd.bin
2cb7cffe6898b24bffb42f458692356b56cf8186bc9d806687ffddb45d527cfe
pdf-font-stream PDF embedded font (sfnt) at offset 0x8DCD 18524 bytes