Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d6061a7b4eb429…

MALICIOUS

PDF

37.8 KB Created: 2020-08-31 17:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1764dda02c63b79c3cb664fd2c99ce29 SHA-1: 52679ed27507be9d12d9b48a906d78252032b447 SHA-256: 18d6061a7b4eb429043bbff1343aef010ba1fcdf7de3801bff30960bab8fddd8
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=nts+kp+tevta+form'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs. The presence of a 'download button' lure and a high ML classifier score further support its malicious nature. The document body, though heavily obfuscated, contains the malicious URL and appears to be generated by wkhtmltopdf, suggesting a programmatic approach to creating malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=nts+kp+tevta+form
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_36f468c2b56047349a83bb289edc0dd2.pdf
    • https://static.usrfiles.com/ugd/90c678_26c2ef1950c84acba3ed2979f235d3fd.pdf
    • https://static.usrfiles.com/ugd/078c79_3ae85512603d49a4b23842988ca2631e.pdf
    • https://static.usrfiles.com/ugd/7f16bd_01a01561136f4839ade1927eb5ec8b3b.pdf
    • https://static.usrfiles.com/ugd/3826db_464b234183b147dfa896927602e2093f.pdf
    • https://static.usrfiles.com/ugd/07e02c_cf633248aa794bf7a1231bf58a00f1c1.pdf
    • https://static.usrfiles.com/ugd/b8c837_a1c8e0aa06f8420399027d1e12471151.pdf
    • https://cdn.shopify.com/s/files/1/0434/6108/3301/files/40464469274.pdf
    • https://cdn.shopify.com/s/files/1/0434/0328/0551/files/55451602535.pdf
    • https://cdn.shopify.com/s/files/1/0437/1811/5480/files/tenamidak.pdf
    • https://cdn.shopify.com/s/files/1/0452/5355/8434/files/american_english_file_2_workbook_gratis.pdf
    • https://static.usrfiles.com/ugd/b8c837_6f7f3190808d45b599d585a6502508f3.pdf
    • https://static.usrfiles.com/ugd/ecec20_e3d6db3e1777478d85a7e49f2d38cdf1.pdf
    • https://static.usrfiles.com/ugd/b8c837_f52ec25b35d0407d8f27524e9b91a89d.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005664.bin
1f0f522e02b578d9a0ce26eaf0ec2964655ed96ead19dbdc3305ec193d61b31f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5664 5108 bytes
font_01_sfnt_off000067c4.bin
d2e7efeef10b079e0f5f2b6d7acee5c70c07a9749e6a173b78bffed45632c95d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67C4 10176 bytes

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