Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c529e71ea051fa4…

MALICIOUS

PDF

40.6 KB Created: 2020-08-24 08:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c790955721df0deeecb3e296b13eea81 SHA-1: 7f9a59e15ab033fda825c96c40288b634ef44c8a SHA-256: 6c529e71ea051fa4eebcf4e74a69236a61075b0477139f1617ba314c8e3555c6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link that redirects to a known malicious infrastructure, indicating a phishing or redirection attempt. The document body, though heavily obfuscated, contains the URL that triggers the heuristic. The presence of multiple embedded URLs, including one pointing to a potentially malicious domain, supports the classification as a malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.com/pify?keyword=reference+sheet+en+francais
    • http://zusemanag.brurosa.com/uploads/1/3/1/4/131438304/lefetudi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9975/8497/files/47987780828.pdf
    • https://cdn.shopify.com/s/files/1/0431/0777/8717/files/19644308845.pdf
    • https://cdn.shopify.com/s/files/1/0428/0467/4727/files/subtracting_like_fractions_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0440/0496/6565/files/vajejes.pdf
    • https://cdn.shopify.com/s/files/1/0439/3133/6859/files/dujewifixigibagopa.pdf
    • https://cdn.shopify.com/s/files/1/0433/5848/6678/files/sanikopowabojaluw.pdf
    • https://cdn.shopify.com/s/files/1/0429/2490/0515/files/sivezop.pdf
    • https://cdn.shopify.com/s/files/1/0457/0673/9868/files/73665614405.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_off00006262.bin
86fe50314a92bf6ae67fa09cfab5b49d3376aa08fa495252041e78129fb0c5c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6262 4944 bytes
font_01_sfnt_off0000732f.bin
2f562405def894af9a7a52b87cf5bbae6dbe2b88644e1b6246a9543a9a090a75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x732F 10224 bytes

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