Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b988d66d16e88cf…

MALICIOUS

PDF

42.7 KB Created: 2021-05-12 06:00:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: a400ffd78813ff69ee1207b6283a0ff7 SHA-1: 8c2335f1c016ecaa486e4e5a6cb59709b0af151e SHA-256: 9b988d66d16e88cfe37ffac9a43f13dea22c227340529ff88b1776949a4832e6
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for free in-game currency, specifically mentioning 'Roblox Free Robux'. It includes a high-confidence heuristic firing for a 'GAME_HACK_REDIRECT_LURE' pointing to the URL 'https://netcdn.xyz/app/431946152/roblox-free-robux-no-verification-game-hack'. This suggests the document is designed to trick users into visiting a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/431946152/roblox-free-robux-no-verification-game-hack PDF link annotation
    • https://www.nordicstar.co.uk/uploads/files/files/roblox-tix-generator_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/how-to-get-roblox-credit-for-free_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/free-spin-coin-master-iphone_GM406889139.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/minecraft-114-4-download-free_GM479516143.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/coin-master-mod_GM406889139.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/coin-master-free-spins-daily-link-updated_GM406889139.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/coin-master-pet-food-hack_GM406889139.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/coin-master-daily-free-spins-link-today-haktuts_GM406889139.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/free-rare-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/free-roblox-hair-girl_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/free-coins-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/roblox-hack-ga_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/how-to-hack-coin-master-game-2021_GM406889139.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/coin-master-hack-2021_GM406889139.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_003_off00004a46.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A46 25068 bytes
SHA-256: 10daddf3ff2d36572f71554dd7ddf4b643316494f034200b49dd24c49153c963
font_01_sfnt_off0000833a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x833A 18676 bytes
SHA-256: d88aecf2630d4fcf6e85b9a2b5560aad6055705ec2bb19cbd5d89ce1bd292ac8