Malicious PDF — malware analysis report

Static analysis result for SHA-256 af41d6783d0786ac…

MALICIOUS

PDF

46.9 KB Created: 2021-06-03 22:13:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 84c91f3b35c39e11d7c6224a896e9204 SHA-1: 8fa47f9e3dbbf7f9d92d460605aa83b48394b6db SHA-256: af41d6783d0786accca9a6de32f083f03535b06f7e6658928093cecf3554acd9
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document employs a game hack lure and displays a fake CAPTCHA to deceive users into clicking malicious links. The primary link, https://netcdn.online/app/406889139/coin-master-hack-pc-game-hack, likely leads to a second-stage payload or phishing page. While no scripts were directly extracted, the PDF structure and heuristics suggest exploitation of PDF vulnerabilities or embedded JavaScript to facilitate the download and execution of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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
  • 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/406889139/coin-master-hack-pc-game-hack PDF link annotation
    • http://www.js100.com/uploads/ckeditor/files/coin-master-free-items_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-robux-hack_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-get-free-airpods-tiktok_GM835599320.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-get-free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/roblox-promo-codes-2021-robux_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-robux-real-working_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-minecraft-capes-no-mods_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/buy-robux-free_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-spins-and-coins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/roblox-free-clothes-codes_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/minecraft-java-account-free_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-hack-unlimited-spins-game-download_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/uprobuxcom-free-robux_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-views-tiktok_GM835599320.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/can-lucky-patcher-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005162.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5162 25792 bytes
SHA-256: 1cf597e1fa9c90aedfc5a5f4353658460725b98c316228490a1c86f3878d8bbd
font_01_sfnt_off00008b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B3E 17868 bytes
SHA-256: 4813da8d3392ee5be528635b0fa067fda57eeb52b921389f98d36b8b85521abf
font_02_sfnt_off0000abfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABFC 3264 bytes
SHA-256: e32c06502c11b52acb5e814091c5fdbffd1e2a904ac7a9cfb8b5b180bd139088

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