Malicious PDF — malware analysis report

Static analysis result for SHA-256 d66604773b5883e1…

MALICIOUS

PDF

41.2 KB Created: 2021-05-19 01:36:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: a57adcd8f356584b2ffb2fbf8647fb1c SHA-1: f202b7a619700b7f11ad2461c9a7cd45433c2dfe SHA-256: d66604773b5883e1c273c57fb2f4daff01243b98ece0fd3297f29c53aa5ff7de
162 Risk Score

Malware Insights

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

The PDF document contains a lure impersonating Netflix, presenting a fake CAPTCHA and a download button to trick the user into clicking a malicious link. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external URIs indicates an attempt to redirect the user to a potentially harmful site for credential harvesting or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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
  • 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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/835599320/without-tiktok-free-followers-game-hack.
  • 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/835599320/without-tiktok-free-followers-game-hack PDF link annotation
    • http://rumler.pl/images/game-hunters-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://rumler.pl/images/coin-master-tiradas-gratis-2021_GM406889139.pdfIn PDF document text
    • http://rumler.pl/images/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://rumler.pl/images/robux-generator-com_GM431946152.pdfIn PDF document text
    • http://rumler.pl/images/coin-master-20-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://rumler.pl/images/coin-master-hack-apk-free-download_GM406889139.pdfIn PDF document text
    • http://rumler.pl/images/how-to-make-roblox-clothes-for-free_GM431946152.pdfIn PDF document text
    • http://rumler.pl/images/offers-to-complete-and-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://rumler.pl/images/free-robux-without-survey_GM431946152.pdfIn PDF document text
    • http://rumler.pl/images/coin-master-freebies_GM406889139.pdfIn PDF document text
    • http://rumler.pl/images/coin-master--hack_GM406889139.pdfIn PDF document text
    • http://rumler.pl/images/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://rumler.pl/images/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • http://rumler.pl/images/minecraft-ore-finder-mod_GM479516143.pdfIn PDF document text
    • http://rumler.pl/images/free-roblox-boy-hair_GM431946152.pdfIn PDF document text
    • http://rumler.pl/images/coin-master-free-attack-hack_GM406889139.pdfIn PDF document text
    • http://rumler.pl/images/free-robux-stream_GM431946152.pdfIn PDF document text
    • http://rumler.pl/images/get-coin-master-spins-free_GM406889139.pdfIn PDF document text
    • http://rumler.pl/images/coin-master-free-spins-and-chips_GM406889139.pdfIn PDF document text
    • http://rumler.pl/images/free-spins-for-coin-master-2021_GM406889139.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
stream_003_off000047c0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47C0 24372 bytes
SHA-256: 2be09859bc50c2e46e9ff2241dc6e410ad61fdc898f63ac57bcdc9244a376f6f
font_01_sfnt_off00007f18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F18 18200 bytes
SHA-256: 3b9c85fb8e2d85bbfc7c2c35d46ba274735086e1b2212e72071cef60a7abcc1f

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