Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c3e7123509f528e…

MALICIOUS

PDF

62.6 KB Created: 2020-08-09 00:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1680e49703e0c1c952f6c920ff7a75da SHA-1: db80d39312493054eee7ba44b834a02c9e83b665 SHA-256: 9c3e7123509f528eed5f9065b04424d2029c057a64094336835e571f8b07fa0a
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. One prominent link, 'https://ttraff.cc/pify?keyword=design+and+build+contract+pdf', is directly associated with malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to this URL and other Shopify-hosted PDFs, suggesting a link farm designed to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=design+and+build+contract+pdf
    • http://pibufa.calliejcphotography.com/uploads/1/3/0/8/130814297/lefogofawu_rodalumalijut_bikofawesug_dimusilufivumiw.pdf
    • http://files.shirleybrowskyfibredesigner.com/uploads/1/3/1/6/131606758/6952301.pdf
    • http://files.themuseprojectnyc.com/uploads/1/3/1/3/131379312/9646491.pdf
    • https://cdn.shopify.com/s/files/1/0430/8893/7120/files/dotilibesefu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4352/8609/files/xakekalisunenoka.pdf
    • https://cdn.shopify.com/s/files/1/0434/7258/4870/files/git_github._com_permission_denied_publickey.pdf
    • https://cdn.shopify.com/s/files/1/0429/0071/7727/files/81774776082.pdf
    • https://cdn.shopify.com/s/files/1/0430/4538/8442/files/kemolo.pdf
    • https://cdn.shopify.com/s/files/1/0433/1008/8360/files/jelefaxapafo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tokon.pdf
    • https://cdn.shopify.com/s/files/1/0436/3033/0016/files/26282448580.pdf
    • https://cdn.shopify.com/s/files/1/0437/8938/5888/files/rexx_mainframe_tutorial_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0437/5255/4657/files/26484302010.pdf
    • https://cdn.shopify.com/s/files/1/0437/0874/3835/files/wayside_school_books.pdf
    • https://cdn.shopify.com/s/files/1/0431/6784/2465/files/55188061601.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_off0000b6d8.bin
5567fcd89567c824373758dcf81c35b08d74dc479665fc31ef101b7a1b74cee2
pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D8 5464 bytes
font_01_sfnt_off0000c977.bin
70ed6395a69690f9bef44c85038a94758c01dab4d5c19dab512bb12289f590c8
pdf-font-stream PDF embedded font (sfnt) at offset 0xC977 10536 bytes