Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ae153c2a1aa5f7f…

MALICIOUS

PDF

47.1 KB Created: 2021-05-14 17:20:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 3437f37dc925a8eefb8a8081ac06957f SHA-1: cae52fd3161c9fffd5bd5087ce1403c721344731 SHA-256: 1ae153c2a1aa5f7f9f68ca6d90443167be92408f05315b1b1372b2dc097be466
102 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to files with 'robux' or 'coin master' in their names, suggesting a lure for game-related cheats or currency. The presence of a 'download button' heuristic further supports the intent to trick users into downloading content. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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/hack-free-spin-coin-master-game-hack
    • https://nendientu.com/public/upload/files/free-robux-no-human-verification_GM431946152.pdf
    • https://nendientu.com/public/upload/files/coin-master-daily-spin-link-app_GM406889139.pdf
    • https://nendientu.com/public/upload/files/free-robux-promo-codes-2021_GM431946152.pdf
    • https://nendientu.com/public/upload/files/coin-master-free-coins-facebook_GM406889139.pdf
    • https://nendientu.com/public/upload/files/coin-master-game-hacks_GM406889139.pdf
    • https://nendientu.com/public/upload/files/free-coins-coin-master-hack_GM406889139.pdf
    • https://nendientu.com/public/upload/files/free-robux-meme_GM431946152.pdf
    • https://nendientu.com/public/upload/files/free-spins-coin-master-hack-2021_GM406889139.pdf
    • https://nendientu.com/public/upload/files/coin-master-free-spins-android_GM406889139.pdf
    • https://nendientu.com/public/upload/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdf
    • https://nendientu.com/public/upload/files/coin-master-daily-free-spins-link-2021_GM406889139.pdf
    • https://nendientu.com/public/upload/files/free-robux-hacks-no-verification_GM431946152.pdf
    • https://nendientu.com/public/upload/files/free-robux-generator-no-human-verification-2021_GM431946152.pdf
    • https://nendientu.com/public/upload/files/but-link-says-free-robux_GM431946152.pdf
    • https://nendientu.com/public/upload/files/robux-hack-tools_GM431946152.pdf
    • https://nendientu.com/public/upload/files/free-minecraft-maps-pe_GM479516143.pdf
    • https://nendientu.com/public/upload/files/free-robux-scams_GM431946152.pdf
    • https://nendientu.com/public/upload/files/coin-master-free-spins-daily-link-game-mod_GM406889139.pdf
    • https://nendientu.com/public/upload/files/coin-master-pro-hack_GM406889139.pdf
    • https://nendientu.com/public/upload/files/can-i-play-roblox-for-free_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a0e.bin
2a5a070a230f8fd73c783044be1c4f474092cabcc413558294086e2d120cda2d
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A0E 25148 bytes
font_01_sfnt_off00008438.bin
d811e0aca85f3b94c42cd1240eec68b8eb378f3d8be5e408d3f6abd0f11f834d
pdf-font-stream PDF embedded font (sfnt) at offset 0x8438 7332 bytes
font_02_sfnt_off00009650.bin
6e419222a3f00e097ec5a4796a0d55da2a670d2aa1bcbb1aaa1cf298b26301b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x9650 18056 bytes