Malicious PDF — malware analysis report

Static analysis result for SHA-256 4120a5f6ce40e82e…

MALICIOUS

PDF

39.5 KB Created: 2020-09-08 06:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b1d198492a57738a7784c06c91857a2b SHA-1: f58bc37a6ec9ab7213354f81124f864bd35202c7 SHA-256: 4120a5f6ce40e82e354d368053b649668dfff4c09aa7dd2851e056091f59894e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to benign Shopify domains, but one critical link redirects to the known malicious domain ttraff.ru. This suggests a link farm or SEO poisoning tactic designed to trick users into visiting malicious infrastructure. 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.ru/wix?keyword=answer+the+following+questions+traducci%25C3%25B3n+espa%25C3%25B1ol In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2665/3090/files/powys_wedding_ceremonies_booking_form.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3378/6528/files/tamisiligarutok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9590/8761/files/advance_auto_parts_boca_raton_fl.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7730/4481/files/pes_anserine_bursitis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2725/9811/files/35648835755.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8286/6072/files/luraf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1540/5725/files/93555751056.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/e2f7e1_e20c590b383f4302aaf688e15d8e8423.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/7e84b7_e7114a69073d4727adeda761a6f737d1.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2937/2836/files/rutelobelejumibajip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1829/6216/files/nekogatam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1509/2893/files/budget_android_tablet_with_stylus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2208/1448/files/72554887759.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9734/8514/files/wowekanozis.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5736 5972 bytes
SHA-256: 3505abc2ff0c77754c0d0b91f12c1579ade08db359f87a704ee2b66b898495bd
font_01_sfnt_off00006b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B19 10440 bytes
SHA-256: d2fce26e26f65a17453b28ae7e0659107ae0302aa638c6c4728eb2df5752ac24

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