Malicious PDF — malware analysis report

Static analysis result for SHA-256 a586fc706b4f3b9b…

MALICIOUS

PDF

41.8 KB Created: 2020-09-30 17:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: eafd56e754ee02b038e9f585c5fa3d72 SHA-1: 13c0213d598e9976f0a11155457165de936278f8 SHA-256: a586fc706b4f3b9bbe27f2f54de7357dfdccf083dd30d72b975b87fc04731786
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to a known malicious domain, ggtraff.ru. The document body, though heavily obfuscated, includes the same malicious URL and benign-looking URLs hosted on strikinglycdn.com, suggesting a lure to a malicious site. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate it's part of a link farm on disposable hosting.

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 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=derivatives+and+alternative+investments+pdf In PDF document text
    • http://sepilas.nouzarbus.org/uploads/1/3/1/0/131070420/b82e287fda4.pdfIn PDF document text
    • http://files.trainprettywithchas.com/uploads/1/3/1/3/131379246/nomeba_kidavej_nipisowedo.pdfIn PDF document text
    • http://files.pineforestanimalclinic.com/uploads/1/3/2/3/132302716/xijofili_jifilizikovaw.pdfIn PDF document text
    • http://rodezaz.ssppwisrapids.org/uploads/1/3/1/4/131438216/nenepan.pdfIn PDF document text
    • https://site-1037096.mozfiles.com/files/1037096/kalojobetadanalolazi.pdfIn PDF document text
    • https://site-1036754.mozfiles.com/files/1036754/wifovuk.pdfIn PDF document text
    • https://site-1037262.mozfiles.com/files/1037262/22109458485.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/9ed56231-67bc-46c3-96bf-656754b9af20/kixaviwejemadasuje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9dff0bd-1ccd-48d9-81b2-321883271f45/15637137791.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be702f00-5095-4472-9937-6bf611c6735a/wavugoxiniwululijed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcafa225-83b1-4763-b404-7f7f03073062/lativux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b8e795f-3ed4-4379-93c2-e389dbcb41dd/luzoxijorolukojiku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90df985d-28cd-480d-8b6f-b55345594f9d/64317019152.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d990844f-ee6b-4dff-b57e-484eb1c2705a/53168738783.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_off0000657b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x657B 5244 bytes
SHA-256: fdb2059687845ed6ab7cf859da3ad31fb38bd3dbd982d0d6e9a31470c49ea1e6
font_01_sfnt_off00007745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7745 10248 bytes
SHA-256: 57795f418f7a52889d2785b83e82f10157d961d4e6f7b3b17cb794b4afba1f2a

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