Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fccce3264f8758a…

MALICIOUS

PDF

43.0 KB Created: 2021-05-14 06:40:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 013469fd6e24a60bb3e97428ba0d0cf0 SHA-1: a283ca951851e2f3e7803da9721cb0b3a419f5b1 SHA-256: 1fccce3264f8758ac8be7a5cc35f3fcfcc332c3c70bbfdbb7564d30a08f21ee0
102 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to other PDFs, many of which are related to game hacks and cheats, suggesting a link farm designed to attract users seeking such content. The presence of a "download button" heuristic further supports the idea that the document is intended to trick users into downloading additional files. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/406889139/cm-daily-spins-game-hack
    • https://nendientu.com/public/upload/files/coin-master-hack-spins-app_GM406889139.pdf
    • https://nendientu.com/public/upload/files/coin-master-free-coins-facebook_GM406889139.pdf
    • https://nendientu.com/public/upload/files/games-on-roblox-that-give-you-free-robux_GM431946152.pdf
    • https://nendientu.com/public/upload/files/free-robux-no-scam_GM431946152.pdf
    • https://nendientu.com/public/upload/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdf
    • https://nendientu.com/public/upload/files/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdf
    • https://nendientu.com/public/upload/files/is-there-a-way-to-get-free-robux_GM431946152.pdf
    • https://nendientu.com/public/upload/files/coin-master-hack-tool-v1-9-download_GM406889139.pdf
    • https://nendientu.com/public/upload/files/coin-master-free-cards-link_GM406889139.pdf
    • https://nendientu.com/public/upload/files/free-coins-for-flip-master_GM406889139.pdf
    • https://nendientu.com/public/upload/files/make-free-robux_GM431946152.pdf
    • https://nendientu.com/public/upload/files/weird-roblox_GM431946152.pdf
    • https://nendientu.com/public/upload/files/free-download-coin-master_GM406889139.pdf
    • https://nendientu.com/public/upload/files/coin-master-game-hack-kaise-kare_GM406889139.pdf
    • https://nendientu.com/public/upload/files/but-link-says-free-robux_GM431946152.pdf
    • https://nendientu.com/public/upload/files/roblox-phantom-forces-hack_GM431946152.pdf
    • https://nendientu.com/public/upload/files/real-hack-for-coin-master_GM406889139.pdf
    • https://nendientu.com/public/upload/files/how-to-get-free-robux-without-downloading-anything_GM431946152.pdf
    • https://nendientu.com/public/upload/files/free-games-like-minecraft_GM479516143.pdf
    • https://nendientu.com/public/upload/files/free-robux-codes-not-used_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004d02.bin
24d197fa5c1623d7c3f84fe946fed221eff2f47ea2d2a6fdf506e8bfe4c9ccc1
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D02 25332 bytes
font_01_sfnt_off00008660.bin
3219ea0e52318e94ce20b7b3342b9bbf5f3a389bd6fb88bf591e9537762def99
pdf-font-stream PDF embedded font (sfnt) at offset 0x8660 18160 bytes