Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd533bb80d418eb8…

MALICIOUS

PDF

226.7 KB Created: 2021-07-07 01:00:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: d1d98f63b3f1f038f3328f289c0e8f09 SHA-1: 6f349ad8f9c66d179f06fca183fa9251542f56c5 SHA-256: bd533bb80d418eb849745efc1842163855c487655d658dadc8e298786073e4f2
132 Risk Score

Malware Insights

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

The PDF document employs social engineering tactics, including a fake CAPTCHA and a browser extension installation lure, to trick users into downloading potentially malicious content. The embedded URL points to a site offering 'free game hacks', a common lure for malware distribution. The document body, though partially corrupted, contains references to game-related content and the external URL.

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/pokemon-go-free-friend-codes-game-hack
    • https://www.nordicstar.co.uk/uploads/files/files/coin-master-spins_GM406889139.pdf
    • https://www.nordicstar.co.uk/uploads/files/files/free-stuff-on-roblox-2021_GM431946152.pdf
    • https://www.nordicstar.co.uk/uploads/files/files/robux-hack-no-download_GM431946152.pdf
    • https://www.nordicstar.co.uk/uploads/files/files/how-to-get-free-robux-fast-and-easy_GM431946152.pdf
    • https://www.nordicstar.co.uk/uploads/files/files/how-to-get-roblox-premium-for-free-2021_GM431946152.pdf
    • https://www.nordicstar.co.uk/uploads/files/files/how-to-get-minecraft-for-free-on-mobile_GM479516143.pdf
    • https://www.nordicstar.co.uk/uploads/files/files/how-to-get-roblox-credit-for-free_GM431946152.pdf
    • https://www.nordicstar.co.uk/uploads/files/files/how-to-permanently-have-free-robux-with-inspect-element-2021_GM431946152.pdf
    • https://www.nordicstar.co.uk/uploads/files/files/how-to-get-free-unlimited-robux_GM431946152.pdf
    • https://www.nordicstar.co.uk/uploads/files/files/coin-master-free-spins-link-download-apk_GM406889139.pdf
    • https://www.nordicstar.co.uk/uploads/files/files/inappropriate-roblox-games-2021_GM431946152.pdf
    • https://www.nordicstar.co.uk/uploads/files/files/guuudd-info-roblox-online-hack_GM431946152.pdf
    • https://www.nordicstar.co.uk/uploads/files/files/box-get-free-robux-roblox_GM431946152.pdf
    • https://www.nordicstar.co.uk/uploads/files/files/free-roblox-card-code-generator-no-survey_GM431946152.pdf
    • https://www.nordicstar.co.uk/uploads/files/files/hack-velocidad-del-juego-x3-roblox_GM431946152.pdf
    • https://www.nordicstar.co.uk/uploads/files/files/roblox-free-robux_GM431946152.pdf
    • https://www.nordicstar.co.uk/uploads/files/files/coin-master-unlimited-free-spins-link-2021_GM406889139.pdf
    • https://www.nordicstar.co.uk/uploads/files/files/coin-master-apk-hacked-3526_GM406889139.pdf
    • https://www.nordicstar.co.uk/uploads/files/files/roblox-free-robux-hack-no-verify-download_GM431946152.pdf
    • https://www.nordicstar.co.uk/uploads/files/files/roblox-tix-generator_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_023_off00031f35.bin
f637b3f795dccb3642becdc828219203eed7ef45c89cdc54cee6f21b4cb37603		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31F35 25576 bytes
font_01_sfnt_off00035b40.bin
dd0f3e37770ce8fc0cbfe0f6c6e5e2ffcb24ee7144459b3b15db88b29c40d6e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x35B40 18652 bytes

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