Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b42c6133485a090…

MALICIOUS

PDF

52.0 KB Created: 2021-06-03 22:02:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 315cb9fe399979c6e573fb69b685be6b SHA-1: feb78dff3a082629a42fbd70f59c67c37f3a21e2 SHA-256: 3b42c6133485a090762e5aa963af3e369ed6d9c44de1286b2f582d3078f7764f
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9464

Heuristics 4

  • 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.
  • 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/pastebin-roblox-hack-script-game-hack PDF link annotation
    • http://www.js100.com/uploads/ckeditor/files/free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/code-free-robux_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/www-rubux_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-get-free-robux-jailbreak_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-daily-gift-free-spins-and-coins-link-today_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-tiktok-fans-no-human-verification-or-downloading-apps_GM835599320.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/robux-hack_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/minecraft-apk-download-v1-144-2-free_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/robux-free-co_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-get-minecraft-for-free-on-xbox-one_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-hack-apk-33-download_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-spin-gratis-coin-master_GM406889139.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/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-free-spins-today-39_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/robux-prices_GM431946152.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_off0000500d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x500D 26156 bytes
SHA-256: e1ecdb41958c4724715f81a224b28036b242bb4ebdfb04830c17c19b95a02fd6
font_01_sfnt_off00008c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C92 8132 bytes
SHA-256: e6d68e720ea5acf9dccbf7ffde18db6f65c62a99ab7725aa43e30329033a7787
font_02_sfnt_off0000a77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA77F 18736 bytes
SHA-256: b17eef1e2f58cd1cf11e57f52a2fdcbea8e81a3e57251752d20477e8530ed4ee

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