Malicious PDF — malware analysis report

Static analysis result for SHA-256 df9d234544ae1cf4…

MALICIOUS

PDF

33.8 KB Created: 2021-07-20 13:40:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 62252cd1db9128edbe2b3d21c5f13454 SHA-1: 37db3cb93d40c767b44dd9e189df13bb4af5914c SHA-256: df9d234544ae1cf4a2a3e3173a88bb7a0316a945c3cfe88144dbcf0fcaaf29d9
62 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document contains multiple embedded URLs and a prominent call-to-action related to 'Free Robux', indicating a phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious websites, likely for credential harvesting or second-stage payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 4

  • 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 http://netcdn.tw/app/431946152/get-free-robux-2021-game-hack PDF link annotation
    • http://hilro.co.za/images/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://hilro.co.za/images/how-to-start-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://hilro.co.za/images/robux-free-2021_GM431946152.pdfIn PDF document text
    • http://hilro.co.za/images/minecraft-realms-free-trial_GM479516143.pdfIn PDF document text
    • http://hilro.co.za/images/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • http://hilro.co.za/images/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://hilro.co.za/images/free-likes-for-tiktok_GM835599320.pdfIn PDF document text
    • http://hilro.co.za/images/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://hilro.co.za/images/minecraft-free-computer-game_GM479516143.pdfIn PDF document text
    • http://hilro.co.za/images/free-tiktok-likes-no-human-verification-or-downloading-apps_GM835599320.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_off00002c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C47 23288 bytes
SHA-256: 824738474a1e1ef9a85c6e7eb8c904556a23f96b85e67853dc392f9d40be11be
font_01_sfnt_off000060dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60DD 18708 bytes
SHA-256: 40c7a65fceaaf83cb97aa7fc463573c7ac7212173c6b25107aa06e33ac478d47

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