Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8c36c2c1beacc71…

MALICIOUS

PDF

41.0 KB Created: 2020-08-23 07:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ae1cd8bbc7359a958471c98194443eb SHA-1: 7210e91e78f61726d4ae68412dffaf7cc09ddedd SHA-256: e8c36c2c1beacc7152d064d8ad055055fe500c286b73eed0d2a4859d4914c949
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, directing users to a URL associated with malicious activity. Additionally, it exhibits characteristics of a PDF SEO link farm, with numerous links to external PDFs, likely to improve search engine ranking for malicious content. The document body, though heavily obfuscated, contains the URL that triggered the malicious redirector heuristic, suggesting a lure to a malicious site.

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.com/pify?keyword=microscope+diagram+worksheet
    • http://gorofinev.nyehyrst.com/uploads/1/3/0/9/130969408/zojuvafixavanif.pdf
    • http://files.cloudychain.us/uploads/1/3/1/4/131406714/kusixedax.pdf
    • http://files.elizabethtreadwell.com/uploads/1/3/1/0/131070051/vaxujuloresumajeno.pdf
    • http://files.endurancegbsouthwest.com/uploads/1/3/0/8/130874627/sifivaguwukewun.pdf
    • https://cdn.shopify.com/s/files/1/0428/9524/5475/files/gixawadi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5959/2864/files/50_shades_of_gray_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/2562/0374/files/talogufuxasotefikabozo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3776/9384/files/jaguars_injury_report_week_14.pdf
    • https://cdn.shopify.com/s/files/1/0438/4168/3618/files/57952346945.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/93875660723.pdf
    • https://cdn.shopify.com/s/files/1/0439/0040/3880/files/compound_sentences_worksheet_second_grade.pdf
    • https://cdn.shopify.com/s/files/1/0433/6631/8230/files/19144239122.pdf
    • https://cdn.shopify.com/s/files/1/0439/9602/0894/files/42003124232.pdf
    • https://cdn.shopify.com/s/files/1/0436/4645/1862/files/40929717286.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_off000060c6.bin
5cdb7e734f3a403a5e3ffaeed4528a47963e249f4e4588ad5b09569941bb82f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60C6 5616 bytes
font_01_sfnt_off000073d7.bin
0efd32a3cb6e726d703c133f0db0bb012ab230911832d8858a6f8ef86f52012c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73D7 10380 bytes

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