Malicious PDF — malware analysis report

Static analysis result for SHA-256 9329df225d6b0ff0…

MALICIOUS

PDF

51.9 KB Created: 2021-06-03 22:05:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 5cfe400aad456920397459e6883715bf SHA-1: 17a5c42f9f97c6a9b8dada7c4ca62c534e40f505 SHA-256: 9329df225d6b0ff072e49dd7d589b9564849e4223efe93e991d44961375a53d3
90 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, designed to trick users into clicking a malicious link. The primary link, https://netcdn.online/app/431946152/free-robux-without-verification-or-survey-game-hack, is presented as a way to get free in-game currency. Numerous other PDF files are also referenced, likely as part of a broader phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9872

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
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.online/app/431946152/free-robux-without-verification-or-survey-game-hack PDF link annotation
    • http://www.js100.com/uploads/ckeditor/files/free-shirt-templates-roblox_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-get-20210-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-spins-coin-master-links-blogspot_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/2021-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-mod_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/create-minecraft-server-free_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-robux-app-2021_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-spin-coin-master-twitter_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/roblox-exploit-scripts_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-get-free-tiktok-coins_GM835599320.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/tiktok-free-login_GM835599320.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-coin-master-spin-and-coin-link_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-daily-free-spins-link-march-2021_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/hack-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/roblox-password-hacker_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-attack-block-hack_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-card-link-free_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-do-i-get-free-robux-on-roblox_GM431946152.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_004_off00005450.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5450 37452 bytes
SHA-256: d91e008d3a383159ccb03a9ae5420aaf489b5931c81a7a5a82228a7bd9c76126
font_01_sfnt_off0000a5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA5D0 19256 bytes
SHA-256: e141b644a4ecfde99000ea6fb335fe57c508717aca49a84e1609c2cc829300c4

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