Malicious PDF — malware analysis report

Static analysis result for SHA-256 18ca8d7b5b0870e2…

MALICIOUS

PDF

56.0 KB Created: 2020-11-05 19:14:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 74c28d9b110cf4f9a8c11e4717e2e435 SHA-1: 49942473d74ae292db170c57bd646f53ed58cfc3 SHA-256: 18ca8d7b5b0870e24a5e02e88e2d20a39440becfbbae010dd3974d0b5399a146
126 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The document's content, though heavily obfuscated, includes a URL pointing to 'trafffi.ru', which is likely part of the link farm infrastructure. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffi.ru/aws?keyword=google+new+sites+features PDF link annotation
    • https://kozitasulama.weebly.com/uploads/1/3/4/6/134647404/woguzusiwesosur.pdfIn PDF document text
    • https://redawisifakaw.weebly.com/uploads/1/3/4/4/134481039/kidevizulu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366317/normal_5f875dc78eb8e.pdfIn PDF document text
    • https://wepugimi.weebly.com/uploads/1/3/1/0/131070973/8948494.pdfIn PDF document text
    • https://muborite.weebly.com/uploads/1/3/4/4/134442605/227722117ea7bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372355/normal_5f8b4e7bc0c7b.pdfIn PDF document text
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/batagebexi.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/1302795.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370533/normal_5f95ec8ac1b0f.pdfIn PDF document text
    • https://wejakoguxi.weebly.com/uploads/1/3/4/3/134324676/wubazojaj.pdfIn PDF document text
    • https://xitawameduzip.weebly.com/uploads/1/3/4/5/134511141/pevujiputozipufopewa.pdfIn PDF document text
    • https://rogusedi.weebly.com/uploads/1/3/4/4/134433103/4c49fec76252cad.pdfIn PDF document text
    • https://kumevilowe.weebly.com/uploads/1/3/4/5/134598600/xurasuva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391925/normal_5f9c33e58b1e9.pdfIn PDF document text
    • https://miremewokar.weebly.com/uploads/1/3/0/7/130738658/lokekejapiru_nasolebiz_wuzewiwi_sudawadabogew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/c3602732-8897-41ba-9c6a-b37a57e6c41a/manual_j_software_acca_certified.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3f2059b-49e2-436f-8626-7b819a56a27f/kikotirarute.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008fd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FD3 4940 bytes
SHA-256: 6c729b760a99d658b06a035bcecfb77e213b54835c746a0ae5a54efe5ed761f9
font_01_sfnt_off0000a0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA0CF 10544 bytes
SHA-256: d72fc4f827c98dafbf532fb9ec4f67bcc6bc6ec9c25eaf7be6f42ce5f59bad4f
font_02_sfnt_off0000c4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4AF 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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