Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d87f8a38fadebfd…

MALICIOUS

PDF

33.4 KB Created: 2021-07-03 14:52:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: f5e6faf57c44c6f258be731b94bfe779 SHA-1: 320d69b3b9b3c9dab986640ea49e5707057bdc3e SHA-256: 4d87f8a38fadebfddd18df1837f1029e623d03f3055f90ee9fad009a0348ac8a
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 0.9824

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/free-robux-for-kids-game-hack PDF link annotation
    • http://www.highsecuritykwt.com/uploaded_files/userfiles/files/coin-master-connection-lost_GM406889139.pdfIn PDF document text
    • http://www.highsecuritykwt.com/uploaded_files/userfiles/files/minecraft-life-hacks_GM479516143.pdfIn PDF document text
    • http://www.highsecuritykwt.com/uploaded_files/userfiles/files/irobux-com-redeem_GM431946152.pdfIn PDF document text
    • http://www.highsecuritykwt.com/uploaded_files/userfiles/files/codes-for-free-clothing-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.highsecuritykwt.com/uploaded_files/userfiles/files/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.highsecuritykwt.com/uploaded_files/userfiles/files/how-to-make-a-roblox-bot-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.highsecuritykwt.com/uploaded_files/userfiles/files/roblox-script-hack_GM431946152.pdfIn PDF document text
    • http://www.highsecuritykwt.com/uploaded_files/userfiles/files/roblox-for-free-no-password_GM431946152.pdfIn PDF document text
    • http://www.highsecuritykwt.com/uploaded_files/userfiles/files/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.highsecuritykwt.com/uploaded_files/userfiles/files/hack-coin-master-apk-2021_GM406889139.pdfIn PDF document text
    • http://www.highsecuritykwt.com/uploaded_files/userfiles/files/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://www.highsecuritykwt.com/uploaded_files/userfiles/files/robux-generator-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.highsecuritykwt.com/uploaded_files/userfiles/files/how-to-get-free-robux-on-android_GM431946152.pdfIn PDF document text
    • http://www.highsecuritykwt.com/uploaded_files/userfiles/files/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.highsecuritykwt.com/uploaded_files/userfiles/files/http-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.highsecuritykwt.com/uploaded_files/userfiles/files/how-to-change-roblox-username-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.highsecuritykwt.com/uploaded_files/userfiles/files/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://www.highsecuritykwt.com/uploaded_files/userfiles/files/free-united-nations-siterobloxcomgames_GM431946152.pdfIn PDF document text
    • http://www.highsecuritykwt.com/uploaded_files/userfiles/files/minecraft-bedrock-client_GM479516143.pdfIn PDF document text
    • http://www.highsecuritykwt.com/uploaded_files/userfiles/files/hack-exploit-roblox-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_off00002b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B9A 22672 bytes
SHA-256: 5074932500a7ad1c9c4ecfd106d0166527e99167a01f5a373c37524d43dcc049
font_01_sfnt_off00005de6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DE6 19012 bytes
SHA-256: afbbc6672e5e67d3d08182cb82f0154e2527ac7a9675429207b3e1307e5db0cb

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