Malicious PDF — malware analysis report

Static analysis result for SHA-256 21210ac13ce06fc6…

MALICIOUS

PDF

32.8 KB Created: 2021-07-21 15:03:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 625ec2676c7894107eb7e9b17514d007 SHA-1: 1f376996854587682293a8b3552055b69a0bdb0b SHA-256: 21210ac13ce06fc6d3c7f5930176ea84ebc7a64eeb2d979dd5216d9350c1c487
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 0.9900

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/how-to-get-free-robux-codes-game-hack PDF link annotation
    • https://www.iie.edu.au/wp-content/uploads/fsqm-files/free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.iie.edu.au/wp-content/uploads/fsqm-files/free-minecraft-account-generator_GM479516143.pdfIn PDF document text
    • https://www.iie.edu.au/wp-content/uploads/fsqm-files/minecraft-bedrock-edition-download-pc-free_GM479516143.pdfIn PDF document text
    • https://www.iie.edu.au/wp-content/uploads/fsqm-files/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.iie.edu.au/wp-content/uploads/fsqm-files/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • https://www.iie.edu.au/wp-content/uploads/fsqm-files/freer-pro-tiktok_GM835599320.pdfIn PDF document text
    • https://www.iie.edu.au/wp-content/uploads/fsqm-files/free-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.iie.edu.au/wp-content/uploads/fsqm-files/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://www.iie.edu.au/wp-content/uploads/fsqm-files/give-me-free-robux_GM431946152.pdfIn PDF document text
    • https://www.iie.edu.au/wp-content/uploads/fsqm-files/can-you-make-a-minecraft-server-for-free_GM479516143.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_off00002b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B4F 22372 bytes
SHA-256: c673a56feba900f756e6e382cf70a49ee9a9a5179784b9fd50a7ef60d64a13b6
font_01_sfnt_off00005cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CEF 18640 bytes
SHA-256: 717d8f6a8bc593f0af8780c548dc1efbcecb7787422593aa31f0cce5729e7174

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