Malicious PDF — malware analysis report

Static analysis result for SHA-256 84212e6402cb87c9…

MALICIOUS

PDF

34.7 KB Created: 2021-07-16 06:26:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 33612bc5e56d61d44d1507d6e383f8a5 SHA-1: 6714525eb6bcfc8fc5b9ea7afec9c304daafae74 SHA-256: 84212e6402cb87c9767f7d9a926d73548d9e32aadeb3751a981f6daed6c00d44
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high-confidence heuristic firing for a "game hack" lure, directing users to the URL http://netcdn.tw/app/406889139/how-to-hack-coin-master-game-hack. This URL is likely used to deliver a secondary payload or redirect to a phishing page. The document's structure and embedded links suggest a social engineering attempt to trick users into downloading or visiting malicious content, consistent with spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

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/406889139/how-to-hack-coin-master-game-hack PDF link annotation
    • https://zustsearch.com/uploaded_files/userfiles/files/is-roblox-studio-free_GM431946152.pdfIn PDF document text
    • https://zustsearch.com/uploaded_files/userfiles/files/minecraft-free-no-download_GM479516143.pdfIn PDF document text
    • https://zustsearch.com/uploaded_files/userfiles/files/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • https://zustsearch.com/uploaded_files/userfiles/files/free-robux-org-wee-bl-y-com_GM431946152.pdfIn PDF document text
    • https://zustsearch.com/uploaded_files/userfiles/files/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • https://zustsearch.com/uploaded_files/userfiles/files/robux-free-com_GM431946152.pdfIn PDF document text
    • https://zustsearch.com/uploaded_files/userfiles/files/roblox-server-test-cheat_GM431946152.pdfIn PDF document text
    • https://zustsearch.com/uploaded_files/userfiles/files/take-anyones-robux-robuxian-hack_GM431946152.pdfIn PDF document text
    • https://zustsearch.com/uploaded_files/userfiles/files/instant-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://zustsearch.com/uploaded_files/userfiles/files/how-to-change-your-roblox-username-for-free-no-hack_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_002_off000032f6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32F6 23124 bytes
SHA-256: 04b996874b3d384da3ecec388232aa45ff7f1359c7fb725552610988eb92f658
font_01_sfnt_off0000671c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x671C 17880 bytes
SHA-256: 811ddb8557bc0f5be85009fa6d5ae0baa2b7fc09c58d91c5790597872cecd122

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