Malicious PDF — malware analysis report

Static analysis result for SHA-256 279ad86190d9e8f4…

MALICIOUS

PDF

41.0 KB Created: 2020-08-31 21:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c9f75ce2d3182b6528320b488e90529 SHA-1: 39908b1c98d2f4214b0acf7cb36d5c9c196d4bfa SHA-256: 279ad86190d9e8f4bbce9d31df5f4ae197610b7ecddbeb27477312dfebacf5b6
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a heuristic firing for a malicious redirector link, directing users to 'https://ttraff.cc/wix?keyword=letter+tracing+worksheets+free+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs. The document body, though heavily obfuscated, also contains the same malicious URL, suggesting an attempt to disguise malicious activity within a lure related to 'letter tracing worksheets'.

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.cc/wix?keyword=letter+tracing+worksheets+free+pdf
    • https://cdn.shopify.com/s/files/1/0428/6332/9446/files/53988121125.pdf
    • https://cdn.shopify.com/s/files/1/0459/6341/1616/files/leaf_structure_lab_answers.pdf
    • https://cdn.shopify.com/s/files/1/0452/3307/8429/files/maeve_binchy_books.pdf
    • https://static.usrfiles.com/ugd/f7fbc8_9ffd552e05224b4c81ff45f79c9fef05.pdf
    • https://static.usrfiles.com/ugd/ea78e0_87cd4b83274a47a2a1ed66b486830569.pdf
    • https://static.usrfiles.com/ugd/c618e9_72d8130c91b34715a06b9842f1a1be2e.pdf
    • https://static.usrfiles.com/ugd/eda9ba_107043bcbffd4ca88fa03afe192d7f89.pdf
    • https://static.usrfiles.com/ugd/8b9728_0569872eaf7c4d75a37bc86c58bdcc8f.pdf
    • https://cdn.shopify.com/s/files/1/0428/3485/4051/files/52560828319.pdf
    • https://cdn.shopify.com/s/files/1/0429/2955/3575/files/adjectives_worksheets_for_grade_4_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/5351/3893/files/54847575176.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zigomotixiwututorevibalu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/70945418412.pdf
    • https://cdn.shopify.com/s/files/1/0432/6899/7288/files/47740739089.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_off00005efa.bin
ca8c7cd237af853ef22547bbafc0cafb982eef427e88c41a51b1e52c6f9b6e2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EFA 5480 bytes
font_01_sfnt_off000071b2.bin
38f0691c416941de90fd6511e3c30fb5de25e4056e5bf9ed757446f6ea5d9a0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71B2 11580 bytes

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