Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f55dce2571d40fd…

MALICIOUS

PDF

47.6 KB Created: 2021-06-03 22:01:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 1ffd206be72517e95aa41b028f08502a SHA-1: 38ec02c20f267bf701fb3545286440396b023661 SHA-256: 6f55dce2571d40fde9c6748dbc1d6bd58ba1b8553ea2b37a03108a7a98f8b3ab
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

This PDF document employs a game hack lure to trick users into clicking a malicious link. The link leads to a fake CAPTCHA page, designed to prompt users into downloading further malicious content. The document contains multiple embedded URLs that likely serve as part of this redirection chain.

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/431946152/mobihack-net-roblox-hack-game-hack PDF link annotation
    • http://www.js100.com/uploads/ckeditor/files/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/minecraft-gun-games-free_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/get-coin-master-spins-free_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/what-is-robux-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/androeed-ru-minecraft_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/is-roblox-free-on-xbox_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/hacks-for-minecraft-bedrock_GM479516143.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/how-to-get-free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/is-minecraft-earth-free_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/best-free-spins-link-coin-master_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/i-got-hacked-on-roblox_GM431946152.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/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-make-a-roblox-group-for-free_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-get-free-robux-without-human-verification_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_off000051ee.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51EE 24984 bytes
SHA-256: 029674c3545d63e4651e7c55e1c0d7f95345e03fad48e33847e366b1886c57ed
font_01_sfnt_off00008bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BFF 2832 bytes
SHA-256: 77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2
font_02_sfnt_off000095b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95B0 18768 bytes
SHA-256: 4038ce5e3e0945c6cd976405ec29b4e5783f739c83bcd68413f286c6b350b233

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