Malicious PDF — malware analysis report

Static analysis result for SHA-256 839ce0900411244a…

MALICIOUS

PDF

40.5 KB Created: 2020-09-06 05:21:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 62d76591ab6b78f178f1fc03acb86cf3 SHA-1: 111c95f53c5e224ca4434f38bde32e18a7cd6948 SHA-256: 839ce0900411244a9045f3a9560b5ac15136386b1ba185b50b059a5bd2596ef9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by an ML classifier and contains a significant number of embedded links, many of which point to external PDF files. One of the embedded URLs, 'https://ttraff.link/wix?keyword=agranulocytes+are+formed+in', is identified as a malicious redirector. This suggests the document is part of a link farm or SEO manipulation scheme, potentially leading users to malicious sites or distributing further malware.

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.link/wix?keyword=agranulocytes+are+formed+in In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/bae363_1151c7e1b50f4d6199e7535e4ccd66e7.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/429b25_c8027df3ae3b419284628f1d5675675c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/c70c35_4488c829ad9344328d8e78aeed83f2a6.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b7306e_ca5fe319ea36447087c813f0e47ada6b.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4884/3934/files/21417032481.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3271/4139/files/gejudofupo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5850/3573/files/bosegefoza.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9367/2604/files/57118194654.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8637/1229/files/aula_internacional_1_nueva_edicion.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5064/8223/files/wivate.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0845/7877/files/35122361850.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0609/9605/files/nanedutira.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5419/3047/files/26540573719.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0737/6546/files/songs_by_the_soil.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_off00005e87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E87 5432 bytes
SHA-256: 6b1eca98d2f8fa12e7994c72cffcfc58f06c50597b0b0ffe34ca54c9cc2e53e2
font_01_sfnt_off000070f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70F5 11048 bytes
SHA-256: 502fc273d2e388a2bbc326cbc1e7e528541c70c1a178e3c3950493e3e35af20e

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