Malicious PDF — malware analysis report

Static analysis result for SHA-256 a25c7b0c6c29bbb9…

MALICIOUS

PDF

41.6 KB Created: 2020-10-31 13:00:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 08f91ebcf72deee8af32a1305a9cab60 SHA-1: 15d9502c57990aa50e18e9dae1e5de65c398cc59 SHA-256: a25c7b0c6c29bbb98239014113d5d3920c7623998ff09730063888ece624061a
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, with one identified as a malicious redirector. The ML classifier also flagged the document as malicious. The embedded content, though obfuscated, appears to be a lure related to 'preparation outline examples' and contains links to external PDFs, suggesting a link farm or SEO manipulation tactic to distribute malicious content.

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://gettraff.ru/aws?keyword=preparation+outline+examples In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375340/normal_5f9b2047e7dcd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366358/normal_5f8782161e2bf.pdfIn PDF document text
    • https://neriborotarisim.weebly.com/uploads/1/3/4/3/134345051/maxipilo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368224/normal_5f88797e0f9c9.pdfIn PDF document text
    • https://mabiredozex.weebly.com/uploads/1/3/4/4/134482212/mivalizubebi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366017/normal_5f87038fcdeca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391649/normal_5f9be096f3fb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368475/normal_5f9c5190ec786.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/c1e5d6b0-1e81-4ad6-9403-dba9d0a7e672/jelaxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87e5eb0e-8adf-480f-b15d-e6afb7570ff2/38528484548.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_off00006630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6630 5032 bytes
SHA-256: db6cd7a87476b65873ac7361bbf621e3e07ad7203560e2b350a570944ddcbbaa
font_01_sfnt_off0000773a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x773A 10176 bytes
SHA-256: 2ce960f9b4ec69abf46b6086d443e125826fc466ad83751fe37d64693195cd0c