Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d728c8ba7339102…

MALICIOUS

PDF

34.7 KB Created: 2021-06-26 22:31:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 8dcf8a58ae4d5c9f658141c8e02f44f3 SHA-1: 01b4f445ae75494f4ccdd40d8cb78a69ab5b5a17 SHA-256: 3d728c8ba73391027a7e445e52627519ec3522eb19d262f58f2bcfec2d60c097
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs that are part of a link farm, all promoting methods to hack or gain free items in popular games. The ML classifier and PDF heuristics strongly indicate malicious intent, likely to direct users to phishing sites or download further malicious content. Although no scripts were explicitly extracted, the nature of the embedded URLs and the document's content suggest a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/how-to-hack-your-friend PDF link annotation
    • http://perpus.i2s-learning.com/repository/get-tiktok-followers-free_GM835599320.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/coin-master-online-hack-no-survey-no-password_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/minecraft-pocket-edition-mods-for-free_GM479516143.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/roblox-hacks-intitle-indexof_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/coin-master-fun-hack-online_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/tiktok-free-unlimited-likes_GM835599320.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/how-to-get-roblox-premium-for-free-2021_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/martian-lettuce-coin-master-free_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/cm-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/coin-master-admin-free-spins_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/how-to-get-free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/coin-master-online-free-spin_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/how-to-hack-robux-java-script-pastebin_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/free-robux-please_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/coin-master-hack-for-ios_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-minecraft-shaders_GM479516143.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/coin-master-free-spons-apk-2021_GM406889139.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
font_00_sfnt_off00002fb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FB4 22136 bytes
SHA-256: ca818e05fc718b47bb31e1931c6f86bd9ac1b360aec3527cc1ae5ffd7c5fe76b
font_01_sfnt_off000060a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60A5 19748 bytes
SHA-256: ee7e000016071469e35c98dc7ea5c8f403eadaa951d1b17bfdf56d50535b5213

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