Malicious PDF — malware analysis report

Static analysis result for SHA-256 249c3483d3d39746…

MALICIOUS

PDF

44.3 KB Created: 2020-11-05 20:55:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: e95394f5bbda14d45edcbf3c7c00c22a SHA-1: a8d1da9f4226009458fb2535051c8dfc2432c99b SHA-256: 249c3483d3d397465193f06493c2f72b47ab3a4008dc96abbd8d82aca84f2ed3
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to external PDF files, many hosted on disposable domains or SEO-optimized platforms. One of the primary links directs to 'https://gettraff.ru/123?keyword=saxon+algebra+1+pdf', which is flagged as a malicious redirector. The document body is heavily obfuscated and contains junk data, but the presence of numerous links suggests a link farm or traffic generation scheme, potentially leading to malicious content or further compromise.

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://gettraff.ru/123?keyword=saxon+algebra+1+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4409797/normal_5fa1c1ee3a6c1.pdfIn PDF document text
    • https://busaluvugisegiw.weebly.com/uploads/1/3/4/3/134368440/7130849.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368770/normal_5f9398822cb9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404975/normal_5f9d0b404d344.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365591/normal_5f875ba4bcd5b.pdfIn PDF document text
    • https://nibuxapevu.weebly.com/uploads/1/3/4/6/134601724/56ee3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370740/normal_5f8afbc3ce318.pdfIn PDF document text
    • https://pasukanat.weebly.com/uploads/1/3/4/4/134474220/483f9.pdfIn PDF document text
    • https://dawekemukodo.weebly.com/uploads/1/3/4/4/134491409/a1796799a6a63.pdfIn PDF document text
    • https://nekizinatuzi.weebly.com/uploads/1/3/4/3/134325328/3613082.pdfIn PDF document text
    • https://fewefemuge.weebly.com/uploads/1/3/4/3/134372507/figupetogo-salalosatavugi-nerodirabek-zulitelovesera.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421613/normal_5fa09c0844b0f.pdfIn PDF document text
    • https://fasuwilobavofe.weebly.com/uploads/1/3/4/4/134489762/583904.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390382/normal_5f91e0730388f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366033/normal_5f8717d44cd10.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00006df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DF1 5396 bytes
SHA-256: e721656a934c246508b27d09542ab5290ca14aa6721e8192902f9711f38cfb74
font_01_sfnt_off0000805e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x805E 10692 bytes
SHA-256: b708473f8b21ad322aa08e1c7a6a7e81deff134e5f6b7caf6c9c828f9f4ddb06

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