Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c07c9a566239113…

MALICIOUS

PDF

39.9 KB Created: 2020-09-30 16:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 4e4d178b9c432ae57434bd54cbf9c4c3 SHA-1: 1f6eae7179bd177e6ee6e6ad921328798925922b SHA-256: 6c07c9a566239113c5c07e5eb74dc215f179c1ccfd614dece0b35199f36cf769
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, also contains URLs that appear to be part of a link farm hosted on disposable domains, suggesting a phishing or redirection scheme. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://ggtraff.ru/strik?keyword=arranging+sentences+in+logical+order+worksheets+pdf In PDF document text
    • https://site-1037082.mozfiles.com/files/1037082/28036301149.pdfIn PDF document text
    • https://site-1036826.mozfiles.com/files/1036826/ravogunusuxivuki.pdfIn PDF document text
    • https://site-1036977.mozfiles.com/files/1036977/vuparodumisukojozefo.pdfIn PDF document text
    • https://site-1037135.mozfiles.com/files/1037135/tewekuderezewatariwaviv.pdfIn PDF document text
    • https://site-1036900.mozfiles.com/files/1036900/55031405149.pdfIn PDF document text
    • https://site-1036851.mozfiles.com/files/1036851/zolesijuvugamuvuni.pdfIn PDF document text
    • https://site-1037260.mozfiles.com/files/1037260/29350964639.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/12a7c910-38ed-45de-bf27-9bef885a3b04/fexojesozukigewibiwavim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbb9b18f-2051-4446-b71b-bdcb5153161a/koduzifenidoru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34d902ef-52a3-4edb-82b4-7701444d0173/55772509746.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5268ec2e-70bc-408c-8285-e5e1500de2f8/bidesunikaxulanikewiras.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9347/3947/files/xikaza.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9515/4070/files/zesejoxovetuzomeluk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1283/9834/files/fobiza.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4982/9023/files/xixibapugizivulutetomas.pdfIn 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_off0000685b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x685B 5564 bytes
SHA-256: 1125680add2888f9b23a432a7741051c7cbb007d68844d8d33886d11c32d96f3
font_01_sfnt_off00007b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B57 10272 bytes
SHA-256: d31ff2e63add50d696bed812d8980480cc7e71c836d10c445656059fab7cd09e

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