Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8707c00a36924a2…

MALICIOUS

PDF

46.8 KB Created: 2021-06-08 18:41:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9269c715e65762817c66707ebd2f4376 SHA-1: dfa7e86e1358961625dbc1f7956f5b970e9f5a0d SHA-256: f8707c00a36924a2ea472d47de5308362103570b9d153aaf8293d0d54dd592c4
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links to external PDF files, many of which are related to game cheats and free items, suggesting a lure to download malicious content. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, and the presence of a download button lure further supports this malicious intent. While no scripts were directly extracted, the structure and embedded URLs point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.tw/app/431946152/how-to-hack-in-roblox-prison-life-2.0-game-hack PDF link annotation
    • http://kulturlandschaften.eu/images/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://kulturlandschaften.eu/images/download-minecraft-free-hiapphere_GM479516143.pdfIn PDF document text
    • http://kulturlandschaften.eu/images/coin-master-facebook-free-spins_GM406889139.pdfIn PDF document text
    • http://kulturlandschaften.eu/images/coin-master-time-hack_GM406889139.pdfIn PDF document text
    • http://kulturlandschaften.eu/images/all-coin-master-spin-link-and-free-download_GM406889139.pdfIn PDF document text
    • http://kulturlandschaften.eu/images/minecraft-toys-for-free_GM479516143.pdfIn PDF document text
    • http://kulturlandschaften.eu/images/free-tiktok-followers-no-human-verification_GM835599320.pdfIn PDF document text
    • http://kulturlandschaften.eu/images/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://kulturlandschaften.eu/images/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://kulturlandschaften.eu/images/minecraft-pe-apk-free-download_GM479516143.pdfIn PDF document text
    • http://kulturlandschaften.eu/images/roblox-free-vip-server-jailbreak_GM431946152.pdfIn PDF document text
    • http://kulturlandschaften.eu/images/minecraft-java-free-download_GM479516143.pdfIn PDF document text
    • http://kulturlandschaften.eu/images/coin-master-hack-unlimited-spins-game-download_GM406889139.pdfIn PDF document text
    • http://kulturlandschaften.eu/images/get-free-lives-on-coin-master_GM406889139.pdfIn PDF document text
    • http://kulturlandschaften.eu/images/como-generar-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://kulturlandschaften.eu/images/spin-coin-master_GM406889139.pdfIn PDF document text
    • http://kulturlandschaften.eu/images/coin-master-online-free-spin_GM406889139.pdfIn PDF document text
    • http://kulturlandschaften.eu/images/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://kulturlandschaften.eu/images/coin-master-working-hack_GM406889139.pdfIn PDF document text
    • http://kulturlandschaften.eu/images/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000556e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x556E 26848 bytes
SHA-256: 57e335c4969d9e670f7e4e7469bff9cec7d65397b17d201da6b6108ad967d328
font_01_sfnt_off00009228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9228 18984 bytes
SHA-256: 6b56bc43f800a710039a978f6bdfba84d4cef8fb625ee7579c6b0415a8ff5441

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