Malicious PDF — malware analysis report

Static analysis result for SHA-256 d91cf71471b6e949…

MALICIOUS

PDF

41.3 KB Created: 2020-08-30 19:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a16cf5c20300c6b89e2928432b06016b SHA-1: 6fc8ebe936b38e6a297e20b597cef20b18c4eb3b SHA-256: d91cf71471b6e94974c53f5b0ff965aeab92a20ed47bb87d65cf018ef2d71d64
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/wix?keyword=regular+and+irregular+verbs'. This URL is likely used to redirect users to a malicious site. The document body, though heavily obfuscated, contains references to this URL and other PDF links, suggesting a link farm or redirection strategy. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ttraff.ru/wix?keyword=regular+and+irregular+verbs
    • https://static.usrfiles.com/ugd/5ed537_d1c67db892884442910dbd5a32532bbd.pdf
    • https://static.usrfiles.com/ugd/b8c837_37ebca5215094a1cb1e566d6df96baff.pdf
    • https://static.usrfiles.com/ugd/b8c837_c91f7b46b6004e72a4e186cd9e11a7bd.pdf
    • https://static.usrfiles.com/ugd/1e32c2_6e2cab8d529b457a8428cac4ca682249.pdf
    • https://static.usrfiles.com/ugd/dd4472_8d4ebdbb4fe647edb06e4eb9f789de12.pdf
    • https://cdn.shopify.com/s/files/1/0437/7165/8392/files/basara_ps2_apk.pdf
    • https://cdn.shopify.com/s/files/1/0432/3622/9277/files/lotonepuzorisekoku.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/ropuxikasafomudixaxo.pdf
    • https://static.usrfiles.com/ugd/8127dd_26165ebda3154c5699869f6714227d1e.pdf
    • https://static.usrfiles.com/ugd/b8c837_02d3e4587d254423a7fbd95ea432ab12.pdf
    • https://static.usrfiles.com/ugd/b8c837_9442942980d449109f7e8df780c43b35.pdf
    • https://static.usrfiles.com/ugd/5360f8_788cd8c178c14a28b3c91ca68d1b7788.pdf
    • https://static.usrfiles.com/ugd/4cf28d_6cb0ad9ff1544bcaa444ab8606c2f6ea.pdf
    • https://static.usrfiles.com/ugd/b88e3d_da9dd18ae3474056bca6480f1234a09c.pdf
    • https://static.usrfiles.com/ugd/b8c837_591654e411f94a9eab90d94087a75b17.pdf
    • https://static.usrfiles.com/ugd/3f4b99_2906baf862fb4a6fa0d381a6b96ca1e7.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000625a.bin
b7baba8b19132f6ec452711f2d001be94662da454cb2f129df6478a7f67a3857		 pdf-font-stream PDF embedded font (sfnt) at offset 0x625A 5200 bytes
font_01_sfnt_off0000741c.bin
84e0401c7677927a7d7c409b8b1455978239cdd90e44b0a786d4d6b4375cc6c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x741C 10204 bytes

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