Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd1b90ba4de80441…

MALICIOUS

PDF

43.6 KB Created: 2021-05-17 20:09:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f66abfa553edf75a88aac9cb9bf22029 SHA-1: c39ff5de4fe9ef72b2f4f7903683cc7c8022b49b SHA-256: dd1b90ba4de80441bdbb589ee664a5f8d50d1252f9f73d2c6abc557ebcab7471
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous embedded URLs and a document body that promotes hacks and free items for popular games like Coin Master and Roblox. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm designed to drive traffic to potentially malicious sites. The ML classifier also flagged this PDF as malicious with high confidence. The primary attack pattern involves luring users to download or access content from these external URLs, which likely leads to malware or further phishing attempts.

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/406889139/real-coin-master-hack-2021-game-hack PDF link annotation
    • https://bartonprivate.com.au/sites/default/files/files/how-to-get-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://bartonprivate.com.au/sites/default/files/files/minecraft-multiplayer-free_GM479516143.pdfIn PDF document text
    • https://bartonprivate.com.au/sites/default/files/files/hack-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • https://bartonprivate.com.au/sites/default/files/files/can-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://bartonprivate.com.au/sites/default/files/files/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://bartonprivate.com.au/sites/default/files/files/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
    • https://bartonprivate.com.au/sites/default/files/files/robux-today_GM431946152.pdfIn PDF document text
    • https://bartonprivate.com.au/sites/default/files/files/how-to-get-to-village-3-in-coin-master_GM406889139.pdfIn PDF document text
    • https://bartonprivate.com.au/sites/default/files/files/free-coins-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://bartonprivate.com.au/sites/default/files/files/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • https://bartonprivate.com.au/sites/default/files/files/coin-master-codes_GM406889139.pdfIn PDF document text
    • https://bartonprivate.com.au/sites/default/files/files/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://bartonprivate.com.au/sites/default/files/files/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://bartonprivate.com.au/sites/default/files/files/coin-master-hack-version-2021-free-download_GM406889139.pdfIn PDF document text
    • https://bartonprivate.com.au/sites/default/files/files/free-roblox-outfits_GM431946152.pdfIn PDF document text
    • https://bartonprivate.com.au/sites/default/files/files/coin-master-lucky-patcher-hack_GM406889139.pdfIn PDF document text
    • https://bartonprivate.com.au/sites/default/files/files/coin-master-homepage_GM406889139.pdfIn PDF document text
    • https://bartonprivate.com.au/sites/default/files/files/how-to-get-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://bartonprivate.com.au/sites/default/files/files/free-robux-no-apps_GM431946152.pdfIn PDF document text
    • https://bartonprivate.com.au/sites/default/files/files/free-robux-without-verification-or-survey_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_003_off00004a8f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A8F 26944 bytes
SHA-256: 1067d614d58a1d04a8e46f95abfe29ff7d116141b6101e325ebdd555781024b1
font_01_sfnt_off0000882d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x882D 18192 bytes
SHA-256: b4c41a46567064d4197865bd819757eb36d0b1d423a991f81f4246b2a9d75138

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