Malicious PDF — malware analysis report

Static analysis result for SHA-256 e85371cbaad8f56a…

MALICIOUS

PDF

42.4 KB Created: 2021-05-10 16:33:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: b4388dae66c9b458d070134b1beecf1c SHA-1: 3111acd621b040d64953191c653f0bbabb864e84 SHA-256: e85371cbaad8f56ad42dcaa696e78c14a8bc3dab8e329b8ee76d8f73bee3d419
122 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA or download lure to trick users into clicking a link, which is a common social engineering tactic. The ML classifier strongly flagged this PDF as malicious, and the embedded URL points to a site offering game cheats or account generation. No scripts were extracted, but the PDF structure and heuristics suggest it's designed to redirect the user to a potentially harmful external resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.xyz/app/431946152/free-roblox-accounts-that-work-game-hack
    • https://www.andhrarealty.in/uploaded_files/userfiles/files/what-is-coin-master-app_GM406889139.pdf
    • https://www.andhrarealty.in/uploaded_files/userfiles/files/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdf
    • https://www.andhrarealty.in/uploaded_files/userfiles/files/pop-slots-free-vegas-casino-slot-machine-game-coin-master_GM406889139.pdf
    • https://www.andhrarealty.in/uploaded_files/userfiles/files/wurst-client-download_GM479516143.pdf
    • https://www.andhrarealty.in/uploaded_files/userfiles/files/free-robux-no-gift-card_GM431946152.pdf
    • https://www.andhrarealty.in/uploaded_files/userfiles/files/how-to-get-free-robux-without-paying_GM431946152.pdf
    • https://www.andhrarealty.in/uploaded_files/userfiles/files/can-you-actually-get-free-robux_GM431946152.pdf
    • https://www.andhrarealty.in/uploaded_files/userfiles/files/rbx-place-free-robux_GM431946152.pdf
    • https://www.andhrarealty.in/uploaded_files/userfiles/files/password-free-roblox-accounts_GM431946152.pdf
    • https://www.andhrarealty.in/uploaded_files/userfiles/files/coin-master-free-cards-link_GM406889139.pdf
    • https://www.andhrarealty.in/uploaded_files/userfiles/files/coin-master-rewards-2021_GM406889139.pdf
    • https://www.andhrarealty.in/uploaded_files/userfiles/files/hack-coin-master-for-android_GM406889139.pdf
    • https://www.andhrarealty.in/uploaded_files/userfiles/files/get-free-robux-without-human-verification_GM431946152.pdf
    • https://www.andhrarealty.in/uploaded_files/userfiles/files/legit-free-spins-coin-master_GM406889139.pdf
    • https://www.andhrarealty.in/uploaded_files/userfiles/files/real-free-robux-generator_GM431946152.pdf
    • https://www.andhrarealty.in/uploaded_files/userfiles/files/games-that-give-you-free-robux_GM431946152.pdf
    • https://www.andhrarealty.in/uploaded_files/userfiles/files/roblox-cheat_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004811.bin
4a35d119e42f831e43e8ef4b6bf64efd1290a3a7c6539930b4ca1f131089f62e
pdf-font-stream PDF embedded font (sfnt) at offset 0x4811 25064 bytes
font_01_sfnt_off00008177.bin
5a520a129cd8904d435b2c3265355279d09350e58b7119a0e5602aa69de64cf4
pdf-font-stream PDF embedded font (sfnt) at offset 0x8177 18952 bytes