Malicious PDF — malware analysis report

Static analysis result for SHA-256 98af15db448bb502…

MALICIOUS

PDF

45.0 KB Created: 2020-10-27 11:03:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 64860d961be6285c61c6c083f81dc71f SHA-1: ee91373e7231483d184384ffe439aaaa2f16b26f SHA-256: 98af15db448bb502888f040591511978273fcc23704aacb5a022c88d4982b4c4
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to disposable hosting and are likely part of a link farm designed to manipulate search engine results or distribute malicious content. One critical heuristic identified a link to a known malicious redirector infrastructure, indicating a high likelihood of malicious intent. The ML classifier also strongly flagged this PDF as malicious.

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/strik?keyword=how+to+write+an+opposition+to+a+motion+to+dismiss In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367005/normal_5f876355e0d1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405651/normal_5f959c1cabfc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377120/normal_5f8ea129c57f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368235/normal_5f96c8bc4ec52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417659/normal_5f9624b4aa74a.pdfIn PDF document text
    • https://wurikosaradusif.weebly.com/uploads/1/3/1/3/131384544/1501489.pdfIn PDF document text
    • https://sukowaletudevux.weebly.com/uploads/1/3/0/8/130874669/196a21d4d.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/xojisaxun.pdfIn PDF document text
    • https://dumunevebule.weebly.com/uploads/1/3/0/8/130874169/8d627dc3.pdfIn PDF document text
    • https://zimiduninu.weebly.com/uploads/1/3/1/6/131637103/jakadomabutot_limufawidivaw_zalowabi_dubukikowavoti.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/1/0484/6996/7013/files/43340062807.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/5644/2777/files/graphing_linear_equations.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/5398/9063/files/nivid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8861/8396/files/vugerezevizi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/8541/2546/files/86986720429.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1e6dea8-9ae6-4718-a1ca-57c07f6ddda7/49617556330.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/xaloxaxedaxumiraviz.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/2019_school_calendar_download.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/celerio_tour_h2_brochure.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/74409562841.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_off000072b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72B8 5124 bytes
SHA-256: 2c6513d1d8eec29a7a42c907ef24aee243780b384234acfeca0a0b63a34efcd5
font_01_sfnt_off00008411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8411 10056 bytes
SHA-256: 4084a4fdfd3daada4d90b2ceb34723b0e29934ab25b5161f7ba61f68f82bf9b0

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