Malicious PDF — malware analysis report

Static analysis result for SHA-256 79f2f0f53d1e46df…

MALICIOUS

PDF

228.3 KB Created: 2021-07-05 17:14:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: d16bd4a78a54cd26859edcd6f1d6762f SHA-1: 6a627bfc976d3a539884166b2e3df39b4c872a5d SHA-256: 79f2f0f53d1e46dfa91a0ea2fcd16c46023bd11357071fe5652a0a1ab4833da3
132 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA and a download button lure, aiming to trick the user into downloading a file. The embedded URL `http://netcdn.tw/app/1094591345/when-pokemon-go-free-download-game-hack` likely leads to the malicious payload. While no scripts were explicitly extracted, the PDF structure and heuristics suggest a social engineering attack designed to facilitate malware delivery.

Machine Learning

  • Nyx PDF Classifier clean score 0.0118

Heuristics 6

  • 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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://netcdn.tw/app/1094591345/when-pokemon-go-free-download-game-hack
    • http://lib3tell.stptrisakti.net//repository/roblox-sued_GM431946152.pdf
    • http://lib3tell.stptrisakti.net/repository/coin-master-hack-download-android_GM406889139.pdf
    • http://lib3tell.stptrisakti.net//repository/free-spins-coin-master_GM406889139.pdf
    • http://lib3tell.stptrisakti.net/repository/coin-master-free-spin-redeem-code_GM406889139.pdf
    • http://lib3tell.stptrisakti.net/repository/coin-master-cards-free-cards_GM406889139.pdf
    • http://lib3tell.stptrisakti.net/repository/free-robux-in_GM431946152.pdf
    • http://lib3tell.stptrisakti.net//repository/coin-master-hacks_GM406889139.pdf
    • http://lib3tell.stptrisakti.net//repository/minecraft-app-store-free_GM479516143.pdf
    • http://lib3tell.stptrisakti.net//repository/how-to-get-free-clothing-on-roblox_GM431946152.pdf
    • http://lib3tell.stptrisakti.net/repository/roblox-how-to-get-to-be-free-storytellers-ballad_GM431946152.pdf
    • http://lib3tell.stptrisakti.net//repository/can-you-really-hack-coin-master_GM406889139.pdf
    • http://lib3tell.stptrisakti.net/repository/how-to-get-free-roebucks_GM431946152.pdf
    • http://lib3tell.stptrisakti.net/repository/how-to-hack-roblox-account-2021-new-method_GM431946152.pdf
    • http://lib3tell.stptrisakti.net/repository/coin-master-free-spins-hacktman_GM406889139.pdf
    • http://lib3tell.stptrisakti.net//repository/rbx-com_GM431946152.pdf
    • http://lib3tell.stptrisakti.net/repository/minecraft-hack-app_GM479516143.pdf
    • http://lib3tell.stptrisakti.net//repository/free-minecraft-realms-to-join_GM479516143.pdf
    • http://lib3tell.stptrisakti.net/repository/jailbreak-roblox-hack_GM431946152.pdf
    • http://lib3tell.stptrisakti.net/repository/minecraft-anarchy-server-no-hacks_GM479516143.pdf
    • http://lib3tell.stptrisakti.net/repository/minecraft-windows-10-hack-client-2021_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_023_off000323aa.bin
1d0835d772e61c8e484a477f31026e8e66dd8e3f909ed47de64db0801053e0a5		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x323AA 25576 bytes
font_01_sfnt_off00035f9d.bin
ae23152aeb91cb2039483e06c858b290108e6118cd24298f954b04f338753b8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x35F9D 19304 bytes

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