Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1a87caaedffc179…

MALICIOUS

PDF

43.2 KB Created: 2021-05-15 16:09:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: b8f34a96a5ffeac503e82182a37e6a52 SHA-1: 4400be7805f6df5c81142f6507812af3b9db1ac1 SHA-256: b1a87caaedffc1793580a2401eabb6dd5452e084c307fb4d3a193fe49f064af9
122 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA or human verification prompt, a common lure to trick users into clicking malicious links. The embedded URLs, such as 'https://netcdn.xyz/app/406889139/free-coins-coin-master-haktuts-game-hack', likely lead to the download of a second-stage payload. The presence of a 'Password-protected archive handoff' heuristic further suggests that the user is expected to interact with the document to obtain a password for an encrypted payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/406889139/free-coins-coin-master-haktuts-game-hack
    • http://dismarinamt.com.br/images/coin-master-free-spins-no-verification_GM406889139.pdf
    • http://dismarinamt.com.br/images/coin-master-hack-apk-android-1_GM406889139.pdf
    • http://dismarinamt.com.br/images/roblox-fun-com-free-robux_GM431946152.pdf
    • http://dismarinamt.com.br/images/roblox-free-hats_GM431946152.pdf
    • http://dismarinamt.com.br/images/free-robux-real_GM431946152.pdf
    • http://dismarinamt.com.br/images/coin-master-hack-online-generator-without-human-verification_GM406889139.pdf
    • http://dismarinamt.com.br/images/freerobux-hack-us_GM431946152.pdf
    • http://dismarinamt.com.br/images/coin-master-hack-reddit_GM406889139.pdf
    • http://dismarinamt.com.br/images/free-robux-cards_GM431946152.pdf
    • http://dismarinamt.com.br/images/coin-master-free-chest-link_GM406889139.pdf
    • http://dismarinamt.com.br/images/best-free-minecraft-hacked-client_GM479516143.pdf
    • http://dismarinamt.com.br/images/how-to-get-robux-on-phone_GM431946152.pdf
    • http://dismarinamt.com.br/images/minecraft-mac-free_GM479516143.pdf
    • http://dismarinamt.com.br/images/how-to-hack-someones-account-on-roblox_GM431946152.pdf
    • http://dismarinamt.com.br/images/free-roblox-usernames-and-passwords_GM431946152.pdf
    • http://dismarinamt.com.br/images/robux-claimer_GM431946152.pdf
    • http://dismarinamt.com.br/images/free-rare-cards-for-coin-master_GM406889139.pdf
    • http://dismarinamt.com.br/images/daily-coin-master-free-link_GM406889139.pdf
    • http://dismarinamt.com.br/images/get-free-spins-from-coin-master_GM406889139.pdf
    • http://dismarinamt.com.br/images/how-to-hack-someones-roblox-account_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004d91.bin
f5df6d7babfcf498575c3f6ab9ad466b6173a2ae7a31a77e9dbc399ca306355b
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D91 25500 bytes
font_01_sfnt_off00008767.bin
885405c0f3c82632f67cbbf76e9de88f1d1af146284216a58ab90767d16be517
pdf-font-stream PDF embedded font (sfnt) at offset 0x8767 18020 bytes