Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b691da7f07d0f31…

MALICIOUS

PDF

43.4 KB Created: 2021-05-16 17:41:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: af8dd4db0ae52a12c0541636599c2206 SHA-1: dbabd72d319e51be6e29548c76777a26b8bac002 SHA-256: 5b691da7f07d0f3168e67263822db827dff5cb85531a9148eeddba2571a41aa7
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are structured as SEO-optimized PDF downloads for game cheats and hacks. The ML classifier and the presence of a link farm heuristic strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a lure to download further malicious content, likely involving JavaScript execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/431946152/get-me-free-robux-game-hack
    • https://deutsch-study.com/image/data/files/minecraft-windows-10-edition-free-download_GM479516143.pdf
    • https://deutsch-study.com/image/data/files/7-year-old-roblox_GM431946152.pdf
    • https://deutsch-study.com/image/data/files/coin-master-free-spin-link-daily_GM406889139.pdf
    • https://deutsch-study.com/image/data/files/coin-master-free-spins-link-haktuts_GM406889139.pdf
    • https://deutsch-study.com/image/data/files/roblox-got-talent-piano-hack_GM431946152.pdf
    • https://deutsch-study.com/image/data/files/how-do-you-get-roblox-money_GM431946152.pdf
    • https://deutsch-study.com/image/data/files/free-spins-and-coins-coin-master-links_GM406889139.pdf
    • https://deutsch-study.com/image/data/files/free-spins-promo-code-for-coin-master_GM406889139.pdf
    • https://deutsch-study.com/image/data/files/cheats-for-coin-master_GM406889139.pdf
    • https://deutsch-study.com/image/data/files/coin-master-card-hack-apk_GM406889139.pdf
    • https://deutsch-study.com/image/data/files/free-spins-and-coins-coin-master-2021_GM406889139.pdf
    • https://deutsch-study.com/image/data/files/wwwcoin-master-hack-game-download_GM406889139.pdf
    • https://deutsch-study.com/image/data/files/microsoft-bing-robux_GM431946152.pdf
    • https://deutsch-study.com/image/data/files/how-to-get-free-robux-no-human-verification_GM431946152.pdf
    • https://deutsch-study.com/image/data/files/roblox-free-clothes-generator_GM431946152.pdf
    • https://deutsch-study.com/image/data/files/how-to-become-a-hacker-in-roblox_GM431946152.pdf
    • https://deutsch-study.com/image/data/files/easy-ways-to-get-free-robux_GM431946152.pdf
    • https://deutsch-study.com/image/data/files/orewards-com-free-robux_GM431946152.pdf
    • https://deutsch-study.com/image/data/files/coin-master-links-for-free-spins-2021_GM406889139.pdf
    • https://deutsch-study.com/image/data/files/coin-master-hack-2021-ios-download_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004913.bin
6a1df1b290bbefc6b46358ad27780e5713f6b5a39bd7ae9ea133a40db8d6bf33
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4913 27156 bytes
font_01_sfnt_off00008734.bin
e3f176f8735a7a9c211288ec5f3dfc0a25536bb398bd4870e4b297ba4f960079
pdf-font-stream PDF embedded font (sfnt) at offset 0x8734 18312 bytes