Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b88469240ade6a0…

MALICIOUS

PDF

56.8 KB Created: 2020-11-04 07:10:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d725e29cff9ed4212172df44bd8c7d8a SHA-1: 38ec38b6654e393028bcd97c1e320c900c7d57f6 SHA-256: 7b88469240ade6a01461445b6f33695547b0e83dea10f16de622ae83d83f02a7
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded links, with one specifically identified as a malicious redirector. The document's structure and content strongly suggest it is part of a link farm designed to either distribute malware or engage in SEO manipulation. The ML classifier also flagged this PDF with high confidence.

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://ttraff.ru/123?keyword=common+animals+on+the+oregon+trail In PDF document text
    • https://panemomozig.weebly.com/uploads/1/3/4/5/134503052/3737763.pdfIn PDF document text
    • https://vorabatuzawudun.weebly.com/uploads/1/3/4/5/134582038/3637986.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389603/normal_5f94ce97c6ff5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371258/normal_5f8d3bd03e039.pdfIn PDF document text
    • https://welofubevi.weebly.com/uploads/1/3/1/8/131856084/kegovetojaf-nivosit-mozuzujiriv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367313/normal_5f88a2c83a06b.pdfIn PDF document text
    • https://vovaderinikuxu.weebly.com/uploads/1/3/4/5/134528816/vusimarep_vomovejubo.pdfIn PDF document text
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/7059084.pdfIn PDF document text
    • https://wepugimi.weebly.com/uploads/1/3/1/0/131070973/17d0ebd6de52.pdfIn PDF document text
    • https://gusumadanu.weebly.com/uploads/1/3/2/6/132695601/rutepamesolotowali.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370542/normal_5f9fdb57655ee.pdfIn PDF document text
    • https://buliduxefexefux.weebly.com/uploads/1/3/1/6/131636978/gibosojibiwose.pdfIn PDF document text
    • https://rebivawofud.weebly.com/uploads/1/3/4/3/134375894/zumifovemonozu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369763/normal_5f9c33a344e4b.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/1d4473e2-1472-4c88-a954-207bd2049206/zufutojabixutatose.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_off0000a0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA0FF 5004 bytes
SHA-256: b714b29978c05c4f4852dbcd17c509abe62501c371d3583c149349eb629750ec
font_01_sfnt_off0000b1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1CE 10880 bytes
SHA-256: b51ee6cd4ef681ff311b58760712312c42b8be5ab649960c94c2cc9d82157e79

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