Malicious PDF — malware analysis report

Static analysis result for SHA-256 5428dafa5cb2aaa0…

MALICIOUS

PDF

48.0 KB Created: 2020-10-17 19:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4bfb19f4fb35f164b288441d5cb0f00c SHA-1: 7e2ea0c95e364fa297d835c634ed7f30162d6c61 SHA-256: 5428dafa5cb2aaa02a53d36c5f491d6dac62a6570f55f171ae51489ce38ba7b4
184 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to numerous external PDF files hosted on various domains. One of the primary links, 'https://ggtraff.ru/123?keyword=non+pharmacological+treatment+of+obesity+pdf', is identified as a malicious redirector. The document's structure and the presence of a malicious redirector suggest an attempt to lead users to potentially harmful content, likely for SEO manipulation or to distribute further malware.

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/123?keyword=non+pharmacological+treatment+of+obesity+pdf In PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/zanazanekoxel.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/199877.pdfIn PDF document text
    • https://pepotoxuxomupav.weebly.com/uploads/1/3/1/4/131483830/5995606.pdfIn PDF document text
    • https://fidegobopoj.weebly.com/uploads/1/3/2/8/132815019/de2f578f9.pdfIn PDF document text
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/11af0c1d3e8.pdfIn PDF document text
    • https://folukufisika.weebly.com/uploads/1/3/1/3/131384255/samoza.pdfIn PDF document text
    • https://tegugozitofo.weebly.com/uploads/1/3/0/8/130874592/03095d026f593c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371536/normal_5f8968ae1463b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366042/normal_5f8702b3f15b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367960/normal_5f88aa040fe11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375356/normal_5f8964bb908f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365525/normal_5f8736bee5644.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371543/normal_5f8a0a9fc57fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366312/normal_5f875ad249435.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/90c83c5f-514a-4885-bbfe-87369ae398c3/95356136668.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d50440c7-38f5-41a2-8f93-8c73ae7fe939/lagepodufi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acc9f5fb-be1d-46e5-acc2-53c3cd86f2ab/pemapiripokawupu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a08b78ab-b229-4816-b971-c0a4349ad3ff/nupotudaxutima.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82269b8c-b12e-40af-a435-57c5041d42bc/kaxobufixizuginubunujafa.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_off00007c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C3C 5780 bytes
SHA-256: 8b89a36f37c14878646ffa6b92ea2283c2425d170bb55b6995c8a0a1030a6bb9
font_01_sfnt_off00008fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FBA 10076 bytes
SHA-256: c93d7ec044b3b9943f250f2c337ccd4d0b5b45abeb84ef0ecdb400573f1c447d

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