Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1816556b4c63128…

MALICIOUS

PDF

44.4 KB Created: 2021-06-09 13:56:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0935fdf0595d6d943ca6a69b334077a6 SHA-1: 17a35b3110a8e07e1639a01affa9628735e774d3 SHA-256: d1816556b4c631283b5afc700512981f4659c65d191a598dcba2ed6881d4ed0f
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many of which point to other PDF files with SEO-optimized titles related to games and hacks. This behavior is indicative of a link farm or a phishing lure designed to drive traffic to potentially malicious content. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/spiderman-free-roblox-stuff-game-hack PDF link annotation
    • https://esl.hess.com.tw/image/data/files/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/coin-master-35-13-hack-download_GM406889139.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/coin-master-free-spins-through-coin-pop_GM406889139.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/free-apk-mod-coin-master_GM406889139.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/promo-codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/hack-coin-master-game-apk_GM406889139.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/free-robux-download-app-verification_GM431946152.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/coin-master-hack-spin-generator_GM406889139.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/minecraft-dungeons-download-free_GM479516143.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/huskybuckscom-free-robux_GM431946152.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/hack-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/how-to-get-free-chest-in-coin-master_GM406889139.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/coin-master-free-spins-hacktman_GM406889139.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/coin-master-32-mod-hack-apk-download_GM406889139.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/how-you-get-free-robux_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_off00004e65.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E65 25304 bytes
SHA-256: 3e7fb968d2d70fe0cb84be4a3a961bfa4371867dc164adc95fb2e4047813ae88
font_01_sfnt_off00008894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8894 19152 bytes
SHA-256: 63f0225bac197fc14fd36ab4a83762252eca65f2ccdd9470c2244db89c6c955f

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