Malicious PDF — malware analysis report

Static analysis result for SHA-256 edd4d7fc8aa7beb8…

MALICIOUS

PDF

34.4 KB Created: 2021-07-03 16:36:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: bf5da666db49d3de82c012bf9c057569 SHA-1: 094e77bed9507766c635d30b10b16d734213576d SHA-256: edd4d7fc8aa7beb844738169cf01d6a4dba3ffbe6dfb3ac0f82b1d12d929f249
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which are related to 'free spins' or 'free Robux', suggesting a lure for users interested in online games. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, and the 'ML_NYX_PDF_MALICIOUS' score is very high, strongly suggesting malicious intent. The document likely serves as a phishing or scam document, directing users to potentially malicious websites.

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/406889139/master-coin-free-spin-game-hack
    • https://admin.9credit.vn/data/files/how-to-get-free-spins-in-coin-master_GM406889139.pdf
    • https://admin.9credit.vn/data/files/but-link-says-free-robux_GM431946152.pdf
    • https://admin.9credit.vn/data/files/free-robux-2021_GM431946152.pdf
    • https://admin.9credit.vn/data/files/free-robux-kid-friendly-no-human-verification_GM431946152.pdf
    • https://admin.9credit.vn/data/files/fastest-way-to-get-free-robux_GM431946152.pdf
    • https://admin.9credit.vn/data/files/how-to-hack-m-coins-mcpe-master_GM406889139.pdf
    • https://admin.9credit.vn/data/files/krnl-roblox_GM431946152.pdf
    • https://admin.9credit.vn/data/files/free-roblox-accounts-with-robux-items_GM431946152.pdf
    • https://admin.9credit.vn/data/files/coin-master-free-spins-link-2021-today_GM406889139.pdf
    • https://admin.9credit.vn/data/files/do-new-roblox-player-get-robux-for-free_GM431946152.pdf
    • https://admin.9credit.vn/data/files/coin-master-free-cards-link-2021-today_GM406889139.pdf
    • https://admin.9credit.vn/data/files/hacks-for-exq-tops-roblox_GM431946152.pdf
    • https://admin.9credit.vn/data/files/coin-master-free-spins-link-haktuts_GM406889139.pdf
    • https://admin.9credit.vn/data/files/minecraft-servers-that-allow-hacks_GM479516143.pdf
    • https://admin.9credit.vn/data/files/how-to-hack-roblox-accounts-no-inspect_GM431946152.pdf
    • https://admin.9credit.vn/data/files/roblox-cheats-for-robux-and-tix-no-survey_GM431946152.pdf
    • https://admin.9credit.vn/data/files/free-h-robux-game_GM431946152.pdf
    • https://admin.9credit.vn/data/files/how-to-get-22-000-robux-for-free_GM431946152.pdf
    • https://admin.9credit.vn/data/files/free-coin-master-credit_GM406889139.pdf
    • https://admin.9credit.vn/data/files/how-to-get-free-robux-hack_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003043.bin
501899fddebfc201b61b53e8ed9bca492edbb7303da792e83651ddd2dae5f419
pdf-font-stream PDF embedded font (sfnt) at offset 0x3043 22976 bytes
font_01_sfnt_off000063fc.bin
e7ebdb51c22119da7989f291c4e1e79e43f48b2212e10ddb7071af0af135db83
pdf-font-stream PDF embedded font (sfnt) at offset 0x63FC 18176 bytes