Malicious PDF — malware analysis report

Static analysis result for SHA-256 6099e592d682f477…

MALICIOUS

PDF

73.1 KB Created: 2020-10-31 06:09:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 8cd0b0201d15aa9aab89842eb070dab1 SHA-1: 3a15cceda9cd42c82542320d4087fcfb7162d297 SHA-256: 6099e592d682f47718d1a5d8946f867b9d75cbd65daa970759f9bfb6da2854c1
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links designed to appear as search results, with one prominent link directing to a known malicious redirector. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs suggests an attempt to redirect the user to malicious infrastructure. No scripts were extracted, but the overall structure and URL analysis indicate a phishing or redirection attack.

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.com/123?keyword=erikson%2527s+stages+of+psychosocial+development+chart+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366366/normal_5f8cc04a21324.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373749/normal_5f9cdb4c02e8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408184/normal_5f9545d335e78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370767/normal_5f9c20201b835.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367303/normal_5f95d47882023.pdfIn PDF document text
    • https://jovikuveditowe.weebly.com/uploads/1/3/0/8/130874612/ledediva-tereja-benuliv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406482/normal_5f95d7e17e8f1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/c6bdcdb2-a2a2-44c6-a20b-91599cb9a45f/41738553170.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b37e38e5-d4d0-4c9d-bb03-9d798a25a313/lakewupomutivema.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84109900-f709-41f4-805e-bbe6721e18f3/kilevonete.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF5 5572 bytes
SHA-256: 7a65ed3075f7b40b61640bd6ddd4280d48a3083cebc4822b3b4d3182d0a52a92
font_01_sfnt_off0000e0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D6 12132 bytes
SHA-256: c018274041fc2f050c9d5799a00ee6749b92c5c533ae3d19b2b7fda3fc727b87
font_02_sfnt_off000106ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106ED 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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