Malicious PDF — malware analysis report

Static analysis result for SHA-256 66caf8b154d6130c…

MALICIOUS

PDF

41.4 KB Created: 2020-10-27 12:53:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b7cffeac896d8cdaa6ce2d6538bc1708 SHA-1: 824c38e9923c98503d06f2e2a649622ecaaabbde SHA-256: 66caf8b154d6130c70318bffaad30339137e6efda0d299d00d7ab505c47eb630
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to disposable hosting services, forming a link farm. One of these links, 'https://cctraff.ru/strik?keyword=walmart+custom+cake+cost', is known to redirect to malicious infrastructure. This suggests the document is designed to lead users to malicious sites, likely for phishing or malware distribution.

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://cctraff.ru/strik?keyword=walmart+custom+cake+cost In PDF document text
    • https://zadumeredevasax.weebly.com/uploads/1/3/1/4/131453870/3502486.pdfIn PDF document text
    • https://vikumeniwexawud.weebly.com/uploads/1/3/0/9/130969440/b9b62e.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/kasodopizafazakoxuk.pdfIn PDF document text
    • https://suganolorifumu.weebly.com/uploads/1/3/0/8/130814011/8252780.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375196/normal_5f8d3516cc2b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366027/normal_5f89a467b3e24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407084/normal_5f97f0da7a123.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408704/normal_5f93ba16f2955.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403685/normal_5f9717c9aa2e2.pdfIn PDF document text
    • https://zalawevovupat.weebly.com/uploads/1/3/0/9/130969727/legadaluleza.pdfIn PDF document text
    • https://rokufekajo.weebly.com/uploads/1/3/0/8/130814342/2324931.pdfIn PDF document text
    • https://nefalitarula.weebly.com/uploads/1/3/4/3/134308949/642701.pdfIn PDF document text
    • https://rokufekajo.weebly.com/uploads/1/3/0/8/130814342/zafotoru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/0867/8814/files/how_to_install_sky_factory_4_on_mac.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/8340/2909/files/binabinese.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8098/8310/files/tabla_de_ingresos_para_chip_en_texas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5300e4d-cd4d-40cb-a366-e2755fb78bdc/detalles_de_losa_aligerada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01fe4cb3-390c-4db8-a09d-5c80c00df388/jukakonu.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_off00006159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6159 5020 bytes
SHA-256: b3f45a8116ebad464d62f380b796e538d78ed3f40385c0a2209e34340e80542b
font_01_sfnt_off00007260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7260 12376 bytes
SHA-256: 690763ba0273887e3be0dc2f6fd00c7e8d3b31f87776b962b3bea6482d53288a