Malicious PDF — malware analysis report

Static analysis result for SHA-256 d160da95261ca0bf…

MALICIOUS

PDF

32.0 KB Created: 2021-05-16 07:34:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 7164598930490481c65a485276a0bd2d SHA-1: 4c6a1b67b67f8bcaa22d119a9d8301470b169b45 SHA-256: d160da95261ca0bf4d3ea4bc757aabc700eb5d9d2adc662f22cfbefeeddf6eeb
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous external links, many of which point to domains associated with gaming hacks and free in-game currency. The document body explicitly mentions 'how-to-get-free-robux' and includes a URL to a related PDF, indicating a likely scam or phishing attempt to lure users to malicious sites. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 3

  • 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.
  • 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/how-to-get-free-robux-without-downloading-apps-game-hack
    • https://quatangphongthuy.vn/upload/UploadFiles/files/rbl-gg-free-robux_GM431946152.pdf
    • https://quatangphongthuy.vn/upload/UploadFiles/files/free-spins-for-coin-master-hack_GM406889139.pdf
    • https://quatangphongthuy.vn/upload/UploadFiles/files/how-do-you-get-free-food-in-coin-master_GM406889139.pdf
    • https://quatangphongthuy.vn/upload/UploadFiles/files/free-minecraft-bedrock-server-hosting_GM479516143.pdf
    • https://quatangphongthuy.vn/upload/UploadFiles/files/coin-master-hack-online-cheat_GM406889139.pdf
    • https://quatangphongthuy.vn/upload/UploadFiles/files/free-minecraft-svg-cutting-files_GM479516143.pdf
    • https://quatangphongthuy.vn/upload/UploadFiles/files/earn-robux-sites_GM431946152.pdf
    • https://quatangphongthuy.vn/upload/UploadFiles/files/free-spin-coin-master-hack-2021_GM406889139.pdf
    • https://quatangphongthuy.vn/upload/UploadFiles/files/coin-master-viking-quest-hack_GM406889139.pdf
    • https://quatangphongthuy.vn/upload/UploadFiles/files/coin-master-free-spins-today-39_GM406889139.pdf
    • https://quatangphongthuy.vn/upload/UploadFiles/files/master-coin-free-spin-daily_GM406889139.pdf
    • https://quatangphongthuy.vn/upload/UploadFiles/files/free-roblox-accounts-that-work_GM431946152.pdf
    • https://quatangphongthuy.vn/upload/UploadFiles/files/master-hack-coin_GM406889139.pdf
    • https://quatangphongthuy.vn/upload/UploadFiles/files/how-to-get-free-clothing-on-roblox_GM431946152.pdf
    • https://quatangphongthuy.vn/upload/UploadFiles/files/free-robux-no-human-verification-2021_GM431946152.pdf
    • https://quatangphongthuy.vn/upload/UploadFiles/files/coin-master-coins-free_GM406889139.pdf
    • https://quatangphongthuy.vn/upload/UploadFiles/files/minecraft-net-free_GM479516143.pdf
    • https://quatangphongthuy.vn/upload/UploadFiles/files/minecraft-bedrock-download-pc-free_GM479516143.pdf
    • https://quatangphongthuy.vn/upload/UploadFiles/files/free-coins-and-spins-coin-master_GM406889139.pdf
    • https://quatangphongthuy.vn/upload/UploadFiles/files/free-robux-generator-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004991.bin
10662613cd0ddcbcc5c325adde2c2b7e3a063d10191e81bf90098c1c2fb2fd16
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4991 25712 bytes