Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce41690bb992e5f9…

MALICIOUS

PDF

36.4 KB Created: 2020-09-30 16:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9cb8418e6428b6c1eb2066061167fead SHA-1: d32d0bb61de07c53bf0c729f330bdd4a407fac7d SHA-256: ce41690bb992e5f9d0f3df89d3d42a457efcac8693484cc857405409b654b33e
184 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting or redirector services. The primary malicious URL identified is https://ggtraff.ru/strik?keyword=alfredo+bosi+hist%25C3%25B3ria+concisa+da+literatura+brasileira+pdf, which is flagged as a malicious redirector. The document appears to be part of a link farm designed to manipulate search engine results or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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.
  • 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://ggtraff.ru/strik?keyword=alfredo+bosi+hist%25C3%25B3ria+concisa+da+literatura+brasileira+pdf In PDF document text
    • https://site-1036907.mozfiles.com/files/1036907/tujanidobebaxalidewa.pdfIn PDF document text
    • https://site-1036923.mozfiles.com/files/1036923/56915166129.pdfIn PDF document text
    • https://site-1036730.mozfiles.com/files/1036730/70880608374.pdfIn PDF document text
    • http://mojeguv.ernn.com/uploads/1/3/1/4/131405958/1234932.pdfIn PDF document text
    • http://dawisiku.lowermerionfop28.org/uploads/1/3/1/4/131407045/xavitaxud-vebek.pdfIn PDF document text
    • http://files.marcusgeorge.com/uploads/1/3/1/3/131380717/68d557b01fd.pdfIn PDF document text
    • http://nawivexeb.primarytackle.com/uploads/1/3/2/8/132814838/rikazukufekukezudobe.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/f51b10d5-10a6-4faa-9821-49586e91b087/wimekejemujejigubupeju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecfd5394-5664-45b1-878e-8d6561f38950/90633101331.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57dfef0f-32c3-47b8-ac07-8194768ff35b/61828818166.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e05a3e5-9d91-4d1a-a9fd-06d6123bd0f9/54997110072.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbe1b342-e659-4969-9fb1-b911c9269d46/faxikukiwiroge.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_off00004b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B4A 5508 bytes
SHA-256: 16e054ea8687d1163e5a4c46935b280c2e48ffb1b6bde345597f209d1caa1f7c
font_01_sfnt_off00005dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DC0 11760 bytes
SHA-256: 2d6ff78d8ba98c19fefb627f531c5d7fe77c130c234feaeacc42fcb1efbe1e6b

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