Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b4c080339d09233…

MALICIOUS

PDF

44.3 KB Created: 2020-08-04 21:28:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac837bd972aa84364e297f05077fb999 SHA-1: 693dd87367a61714feb0a18228ae7f1c3401a34a SHA-256: 7b4c080339d09233a29fff83604f0562b10b94780b8ce0cac6b7abd719b863e1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, but one critical link directs to a known malicious redirector. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content. The document body itself is largely obfuscated but contains the URL to the 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.ru/pify?keyword=multiplying+and+dividing+algebraic+expressions+worksheet+pdf
    • http://files.frankhagancontracting.com/uploads/1/3/2/6/132681404/zatamutofineve.pdf
    • http://files.wefixcreditright.com/uploads/1/3/1/4/131455636/sekupumukome.pdf
    • http://files.grapes.global/uploads/1/3/1/3/131383949/belebefupen.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/2571/8678/files/kanozi.pdf
    • https://cdn.shopify.com/s/files/1/0433/3443/4974/files/xavawuwavokakatululebub.pdf
    • https://cdn.shopify.com/s/files/1/0432/5592/2852/files/31997350640.pdf
    • https://cdn.shopify.com/s/files/1/0435/5876/4696/files/fokafizerizomazisofawelu.pdf
    • https://cdn.shopify.com/s/files/1/0432/4347/1003/files/rebunivezofoxejexisa.pdf
    • https://cdn.shopify.com/s/files/1/0429/9702/2879/files/zoxodekarodulefol.pdf
    • https://cdn.shopify.com/s/files/1/0431/3120/7837/files/3616955066.pdf
    • https://cdn.shopify.com/s/files/1/0430/7222/5442/files/kuzogitumutawo.pdf
    • https://cdn.shopify.com/s/files/1/0431/9805/4558/files/didaparuvovejupi.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/keforezuwofijodofaro.pdf
    • https://cdn.shopify.com/s/files/1/0439/2094/9403/files/anemia_por_deficiencia_de_vitamina_b12.pdf
    • https://cdn.shopify.com/s/files/1/0432/0935/9520/files/sasur.pdf
    • https://cdn.shopify.com/s/files/1/0437/3915/2535/files/dirukuxunuzas.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72710717911.pdf
    • https://cdn.shopify.com/s/files/1/0431/7931/1253/files/kinixujobowufabodaj.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_off00006bd1.bin
8c38f9337df84a9487da1ab96050a074b10520adfce4e86e736cb348a924d17b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BD1 5948 bytes
font_01_sfnt_off00008034.bin
46d985977b5ef5690106bfd4f7708a740ef07a83a304df81e5c2403b5fb455d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8034 10232 bytes

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