Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0f0c3d85154ccc0…

MALICIOUS

PDF

45.1 KB Created: 2021-06-11 03:47:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 03f91af9024fd41bade0bb98ad13cdf7 SHA-1: af54b0f2f4dafb51451cd6009329d20779852e36 SHA-256: f0f0c3d85154ccc091021e38d9ee51098a44fbe3f912f380b5c45982d27e2cb4
82 Risk Score

Malware Insights

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

The document's content and heuristics indicate a social engineering attack. It displays a fake CAPTCHA to lure the user into clicking an embedded URL, which is a common tactic for phishing or malware distribution. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, but the presence of a fake CAPTCHA and an external URI strongly suggests an attempt to trick the user into executing further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/how-to-get-build-tools-on-roblox-cheating-game-hack PDF link annotation
    • https://www.ergolight.at/images/hack-robux-sans-verification-humaine_GM431946152.pdfIn PDF document text
    • https://www.ergolight.at/images/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://www.ergolight.at/images/cmaster-club-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.ergolight.at/images/free-robux-scam_GM431946152.pdfIn PDF document text
    • https://www.ergolight.at/images/roblox-booga-booga-hack_GM431946152.pdfIn PDF document text
    • https://www.ergolight.at/images/roblox-hacker-name-generator_GM431946152.pdfIn PDF document text
    • https://www.ergolight.at/images/how-to-get-free-robux-inspect-2021_GM431946152.pdfIn PDF document text
    • https://www.ergolight.at/images/coins-master-hack_GM406889139.pdfIn PDF document text
    • https://www.ergolight.at/images/roblox-rape_GM431946152.pdfIn PDF document text
    • https://www.ergolight.at/images/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.ergolight.at/images/free-coins-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • https://www.ergolight.at/images/free-hacking-2021-jailbreak-roblox-100-sure_GM431946152.pdfIn PDF document text
    • https://www.ergolight.at/images/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • https://www.ergolight.at/images/roblox-verification_GM431946152.pdfIn PDF document text
    • https://www.ergolight.at/images/roblox-hair-for-free_GM431946152.pdfIn PDF document text
    • https://www.ergolight.at/images/free-pet-food-coin-master_GM406889139.pdfIn PDF document text
    • https://www.ergolight.at/images/online-hacking-tricks-coin-master_GM406889139.pdfIn PDF document text
    • https://www.ergolight.at/images/coin-master-free-spins-2021-apk_GM406889139.pdfIn PDF document text
    • https://www.ergolight.at/images/minecraft-wurst_GM479516143.pdfIn PDF document text
    • https://www.ergolight.at/images/when-was-minecraft-free_GM479516143.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_off0000517a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x517A 25644 bytes
SHA-256: c488f11b18c54073ff6ff4971445badb5e60a2751ea111efee8e0aa76db6d321
font_01_sfnt_off00008b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B0F 19168 bytes
SHA-256: 576bf2dc5e29a4f2f8a5089049e5cfdd422830f0b23e918180a6a3754ad3881a

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