Malicious PDF — malware analysis report

Static analysis result for SHA-256 8850c1415df85899…

MALICIOUS

PDF

34.5 KB Created: 2021-07-05 09:21:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 80a8903ca2b621eb65a633dabbb87278 SHA-1: 077f3829cee12e249e7687d92ff915fd156070a0 SHA-256: 8850c1415df85899dd1c1b0117bff686367bf651c98f4e97667f084cb4797a4e
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, identified as a link farm, that point to websites offering 'free Robux' or 'Coin Master spins'. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs suggests a phishing or scam attempt. While no scripts were explicitly extracted, the structure and content indicate a likely attempt to redirect users to malicious sites, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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-survey-game-hack
    • http://jbtlive.com/assets/CKImages/files/where-can-i-get-free-spins-for-coin-master_GM406889139.pdf
    • http://jbtlive.com/assets/CKImages/files/how-do-you-get-free-roblox_GM431946152.pdf
    • http://jbtlive.com/assets/CKImages/files/coin-master-spin-link-free-download_GM406889139.pdf
    • http://jbtlive.com/assets/CKImages/files/autodraw-free-draw-roblox_GM431946152.pdf
    • http://jbtlive.com/assets/CKImages/files/minecraft-com-free_GM479516143.pdf
    • http://jbtlive.com/assets/CKImages/files/coin-master-free-spins-link-blogspot-april-2021_GM406889139.pdf
    • http://jbtlive.com/assets/CKImages/files/coin-master-free-spins-link-download-for-iphone_GM406889139.pdf
    • http://jbtlive.com/assets/CKImages/files/how-do-you-get-free-robux-on-roblox_GM431946152.pdf
    • http://jbtlive.com/assets/CKImages/files/coin-master-golden-card-hack_GM406889139.pdf
    • http://jbtlive.com/assets/CKImages/files/daily-coin-master-spins_GM406889139.pdf
    • http://jbtlive.com/assets/CKImages/files/roblox-how-to-check-a-games-anti-cheat_GM431946152.pdf
    • http://jbtlive.com/assets/CKImages/files/robux-for-free-meme_GM431946152.pdf
    • http://jbtlive.com/assets/CKImages/files/how-to-earn-robux-fast_GM431946152.pdf
    • http://jbtlive.com/assets/CKImages/files/coin-master-spins-free-2021_GM406889139.pdf
    • http://jbtlive.com/assets/CKImages/files/strucid-aimbot_GM431946152.pdf
    • http://jbtlive.com/assets/CKImages/files/bee-swarm-simulator-roblox-hack_GM431946152.pdf
    • http://jbtlive.com/assets/CKImages/files/como-hackear-cuentas-de-roblox-real_GM431946152.pdf
    • http://jbtlive.com/assets/CKImages/files/coin-master-free-daily-spins-and-coins_GM406889139.pdf
    • http://jbtlive.com/assets/CKImages/files/free-animations-roblox-catalog_GM431946152.pdf
    • http://jbtlive.com/assets/CKImages/files/how-to-hack-coin-master-android_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002fb3.bin
01e1d9318be8a185e985596ec84203ff3e1673b22e4ca9100fb092b014fe9121
pdf-font-stream PDF embedded font (sfnt) at offset 0x2FB3 22548 bytes
font_01_sfnt_off000061c4.bin
c0541a5d6200ab17734b4952abc6c0a8b533a715d99044a6ee13c1a52db76e39
pdf-font-stream PDF embedded font (sfnt) at offset 0x61C4 19012 bytes