Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dd23e9f975cef7b…

MALICIOUS

PDF

51.1 KB Created: 2020-08-20 23:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02b1a00f7a781bfeaff5b7ea10aeb999 SHA-1: ca45f1df1e67ee4d3ddcccc640f226c9785f88b1 SHA-256: 5dd23e9f975cef7b186b6378328ea143cb19a4b3c00db28ac72aa39d4797afa8
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to a link farm infrastructure, with one critical link identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be the target of the redirection. The ML classifier strongly indicates maliciousness, supporting the conclusion that this PDF is designed to lead users to harmful content.

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=mastering+chemistry+chapter+24+answers
    • http://files.daphnefatterphd.com/uploads/1/3/0/7/130775306/motalale.pdf
    • http://files.tinaweldy.org/uploads/1/3/1/4/131408415/f0ac5d.pdf
    • http://files.bensvintagevillage.com/uploads/1/3/1/8/131856158/gamonurimiserez.pdf
    • http://files.cliocareer.nl/uploads/1/3/2/6/132696063/rupopit-dizopaf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/2314/5896/files/88300082476.pdf
    • https://cdn.shopify.com/s/files/1/0430/1455/3763/files/altivar_312_solar.pdf
    • https://cdn.shopify.com/s/files/1/0432/0378/8960/files/zopaloxoj.pdf
    • https://cdn.shopify.com/s/files/1/0434/7212/6117/files/financial_accounting_course_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0432/2597/2904/files/35851139708.pdf
    • https://cdn.shopify.com/s/files/1/0428/6906/3836/files/tuzevekoma.pdf
    • https://cdn.shopify.com/s/files/1/0435/6849/6798/files/mijudowukosu.pdf
    • https://cdn.shopify.com/s/files/1/0430/2100/9053/files/application_for_schengen_visa_france.pdf
    • https://cdn.shopify.com/s/files/1/0434/0314/9462/files/27203471969.pdf
    • https://cdn.shopify.com/s/files/1/0431/8819/1396/files/lugugolinegupuwi.pdf
    • https://cdn.shopify.com/s/files/1/0437/6874/2040/files/chemistry_atoms_focused_approach.pdf
    • https://cdn.shopify.com/s/files/1/0457/7578/2054/files/wajedamajufuxawot.pdf
    • https://cdn.shopify.com/s/files/1/0432/0565/6736/files/9937298409.pdf
    • https://cdn.shopify.com/s/files/1/0427/8134/3903/files/wujajabu.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_off000087d8.bin
233603c094538eaff33f19591fb33ff0de6ba8ebf1f90a6ea5a8ad77726c9a32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87D8 5736 bytes
font_01_sfnt_off00009b5a.bin
fbaf2903a226028426b9436fbb65c5fe220e5c24a56c0adb551a6d4ddaa0ec32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B5A 10500 bytes

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