Malicious PDF — malware analysis report

Static analysis result for SHA-256 5639c54da67daefb…

MALICIOUS

PDF

38.6 KB Created: 2020-10-31 00:53:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 76e9f2bfcee98200fe1a20c3b0b63f95 SHA-1: ebc7ba682dc81d1fe40115a6a69ae3637f8eba63 SHA-256: 5639c54da67daefb2db4d0927194f0b91ea6f4f87f993bf6ee8e4732748bcafa
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised as a product listing. The PDF also functions as a link farm, pointing to numerous other PDF files, likely for SEO manipulation or to distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious infrastructure.

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.club/pify?keyword=bonfire+snowboarding+jacket+women%2527s In PDF document text
    • https://tunupufimudodo.weebly.com/uploads/1/3/4/3/134324073/8093001.pdfIn 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/1/0428/3950/7100/files/kobasaninakedoxejoguz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8571/8198/files/61353331944.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/vizuzoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39e488d4-c0d4-417e-a16a-ad3278edb35e/tobofuwojilofajiwibetarix.pdfIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/punur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/6664/4384/files/8112492652.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/1192/2877/files/vakoji.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/43972124181.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4252c6d-3817-4338-9757-ea9ae100cc05/rezewigapizikafimigi.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_off0000542c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x542C 5764 bytes
SHA-256: 047efcb00713822c894c716f85da56234f5f2d0e8d981e0f7f507374ed857e8b
font_01_sfnt_off000067e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67E4 11172 bytes
SHA-256: 7c8dcb51b8d4faf10873f1dd604a8bf0036f3085e953737d693c3bf9af90a72f

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