Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdef4d205473c156…

MALICIOUS

PDF

44.6 KB Created: 2021-05-16 20:06:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 403a78d9f7c2e0910985a403b5445b78 SHA-1: 7b691ec9482614017f901149282511898b2534da SHA-256: fdef4d205473c156f21ad23d5b268f26e2de51492689b845311c539ace5a5cdb
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, many of which point to other PDF files hosted on external domains, suggesting a link farm or redirection mechanism. The ML classifier and the PDF_SEO_LINK_FARM heuristic strongly indicate malicious intent, likely to drive traffic to exploit or phishing sites. While no scripts were explicitly extracted, the structure and embedded links are indicative of a malicious PDF designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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/479516143/toolbox-for-minecraft-game-hack
    • http://kcpb51.ru/images/minecraft-free-minecoins_GM479516143.pdf
    • http://kcpb51.ru/images/coin-master-hack-mod-apk_GM406889139.pdf
    • http://kcpb51.ru/images/how-do-i-get-free-robux-on-roblox_GM431946152.pdf
    • http://kcpb51.ru/images/coin-master-free-spins-link-today-2021_GM406889139.pdf
    • http://kcpb51.ru/images/coin-master-free-spins-hack-no-human-verification_GM406889139.pdf
    • http://kcpb51.ru/images/roblox-hack-site_GM431946152.pdf
    • http://kcpb51.ru/images/haktuts-coin-master-free-spins_GM406889139.pdf
    • http://kcpb51.ru/images/coin-master-free-spins-instagram_GM406889139.pdf
    • http://kcpb51.ru/images/free-robux-pin-codes_GM431946152.pdf
    • http://kcpb51.ru/images/coin-master-daily-free-spins-link-haktuts_GM406889139.pdf
    • http://kcpb51.ru/images/robux-free-online_GM431946152.pdf
    • http://kcpb51.ru/images/minecraft-hacked-client-18_GM479516143.pdf
    • http://kcpb51.ru/images/can-i-play-roblox-for-free_GM431946152.pdf
    • http://kcpb51.ru/images/coin-master-hack-2021-ios_GM406889139.pdf
    • http://kcpb51.ru/images/how-to-get-free-robux-on-roblox-2021_GM431946152.pdf
    • http://kcpb51.ru/images/robux-hack-free-robux_GM431946152.pdf
    • http://kcpb51.ru/images/free-minecraft-hacks_GM479516143.pdf
    • http://kcpb51.ru/images/robux-hack-no-human-verification_GM431946152.pdf
    • http://kcpb51.ru/images/how-to-get-free-spins-on-coin-master_GM406889139.pdf
    • http://kcpb51.ru/images/how-to-get-free-robux-on-roblox_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000481f.bin
00fedd4fb2a2bb542824d3b7c4cdaef4515b36464fa31fae733fcb603f2444d3
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x481F 25296 bytes
font_01_sfnt_off00008225.bin
c2578a292634a901613c1dd9f9883dd4930e6811e59ae03d696f263e56ea17b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x8225 2892 bytes
font_02_sfnt_off00008c0f.bin
becd460d7779cc5c3291c33eac3fb6dff78fe3ea9ee1e8d8b5f7e8ecc5cf93f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C0F 18152 bytes