Malicious PDF — malware analysis report

Static analysis result for SHA-256 211791fc0461e6dc…

MALICIOUS

PDF

35.5 KB Created: 2021-07-05 10:32:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 059981e26dd3860ded20e8a189a3fff4 SHA-1: da3e8033cf7aedf6e7a20b4856401fd97c163c41 SHA-256: 211791fc0461e6dc03b563ece04544e464ef115d54ad18fcf9f6451c5bd55612
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to 'netcdn.tw', which is flagged as a lure for game hacks. The ML classifier also strongly indicated maliciousness. The document body, though obfuscated, contains URLs that reinforce the theme of game hacking and generators. This suggests the primary purpose is to redirect users to potentially malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/7-year-old-roblox-game-hack PDF link annotation
    • http://hpen.gmcc-welling.com/Public/upload/editorfiles/what-happens-if-u-hack-roblox_GM431946152.pdfIn PDF document text
    • http://hpen.gmcc-welling.com/Public/upload/editorfiles/coin-master-hack-version_GM406889139.pdfIn PDF document text
    • http://hpen.gmcc-welling.com/Public/upload/editorfiles/_GM479516143.pdfIn PDF document text
    • http://hpen.gmcc-welling.com/Public/upload/editorfiles/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://hpen.gmcc-welling.com/Public/upload/editorfiles/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://hpen.gmcc-welling.com/Public/upload/editorfiles/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://hpen.gmcc-welling.com/Public/upload/editorfiles/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://hpen.gmcc-welling.com/Public/upload/editorfiles/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://hpen.gmcc-welling.com/Public/upload/editorfiles/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://hpen.gmcc-welling.com/Public/upload/editorfiles/how-to-hack-someones-profile-on-roblox_GM431946152.pdfIn PDF document text
    • http://hpen.gmcc-welling.com/Public/upload/editorfiles/robloxyahoo-hack_GM431946152.pdfIn PDF document text
    • http://hpen.gmcc-welling.com/Public/upload/editorfiles/hacks-roblox_GM431946152.pdfIn PDF document text
    • http://hpen.gmcc-welling.com/Public/upload/editorfiles/free-robux-today_GM431946152.pdfIn PDF document text
    • http://hpen.gmcc-welling.com/Public/upload/editorfiles/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://hpen.gmcc-welling.com/Public/upload/editorfiles/how-to-get-free-robux-no-joke-2021_GM431946152.pdfIn PDF document text
    • http://hpen.gmcc-welling.com/Public/upload/editorfiles/can-you-upload-an-audio-to-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://hpen.gmcc-welling.com/Public/upload/editorfiles/free-robux-working_GM431946152.pdfIn PDF document text
    • http://hpen.gmcc-welling.com/Public/upload/editorfiles/roblox-jacket-free_GM431946152.pdfIn PDF document text
    • http://hpen.gmcc-welling.com/Public/upload/editorfiles/can-you-earn-robux_GM431946152.pdfIn PDF document text
    • http://hpen.gmcc-welling.com/Public/upload/editorfiles/free-robux-codes-2021_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
font_00_sfnt_off000033ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33EC 22556 bytes
SHA-256: ccd5a7d4698e3b36f12ca920bec4ef1aa8f0d4339692218b604feec7b7ccc5a1
font_01_sfnt_off00006625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6625 18880 bytes
SHA-256: 85e4e9e0d9805ef16fec6cb3c84a8d690b5a293c59c21ae1973f218ecc3fb6d4

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