Malicious PDF — malware analysis report

Static analysis result for SHA-256 f57fc3c138b5a423…

MALICIOUS

PDF

41.9 KB Created: 2021-05-18 04:44:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 84519bee070e1aa45a9e7b603f70b1aa SHA-1: ac1201a5020dc1dd6fb614ef6d94e9ea325e4cbf SHA-256: f57fc3c138b5a42303beefd51b5cce1e46b11ea0752a79ce83bb345d2f78d0ba
142 Risk Score

Malware Insights

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

The document displays a fake CAPTCHA and impersonates Microsoft, directing users to click a link that does not match the impersonated brand. This pattern is consistent with credential phishing or malware distribution. The embedded URLs suggest a lure for free in-game currency or hacks, which are common social engineering tactics.

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
  • 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/431946152/roblox-robux-generator-2021-game-hack.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/roblox-robux-generator-2021-game-hack PDF link annotation
    • http://io24.com.ar/images/daily-free-spins_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/get-me-robux_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/free-minecraft-alt-generator_GM479516143.pdfIn PDF document text
    • http://io24.com.ar/images/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/coin-master-free-generator_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/how-to-hack-coin-master-using-es-filer_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/how-to-get-free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/my-roblox-account-was-hacked_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/coin-master-hack-version-download-2021_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/coin-master-apk-hack-download_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/app-store-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/hack-minecraft_GM479516143.pdfIn PDF document text
    • http://io24.com.ar/images/how-to-win-robux_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/real-robux-codes_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/free-robux-without-survey_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/ear-free-spins-for-coin-master_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
font_00_sfnt_off00004862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4862 24228 bytes
SHA-256: 07b71753bab527e159918e72567f86ad73467c7874d4f8ddc0b1037182401983
font_01_sfnt_off00007ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FF2 18660 bytes
SHA-256: 36c7fb5aa9c939457b824274e74d572de6a8f68b62037621f1b97da7e9e8e63e

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