Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc9f35509cd7f49f…

MALICIOUS

PDF

41.1 KB Created: 2020-11-01 02:07:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a8dca51ef9d0328f9b33d152c9887ede SHA-1: b7cb113adf64155010f2055c0056c9209276413d SHA-256: fc9f35509cd7f49f614c749dd3c0d3c2ef024815b08036be4a6a27d98fd6c86d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded links, a significant portion of which point to a link farm designed to redirect users to malicious infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that at least one of these links leads to known malicious redirector infrastructure. The 'PDF_SEO_LINK_FARM' heuristic further suggests a deliberate attempt to create a large number of external links, likely for SEO manipulation or to distribute malware. The ML classifier strongly supports the malicious nature of this PDF.

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 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.
  • 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://gettraff.ru/strik?keyword=worldfree4u+lol+punjabi In PDF document text
    • https://nokiziwevapof.weebly.com/uploads/1/3/4/5/134507241/3011916.pdfIn PDF document text
    • https://xusawoji.weebly.com/uploads/1/3/0/7/130739635/kaleb.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/1/0493/1718/3654/files/towivo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/2742/1122/files/bavunowenasuxifazoni.pdfIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/nanofudinurifuvi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/4870/5434/files/henrys_law_problems_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7039/7352/files/jedavowivirafexaraman.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/58195286434.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/6704/5556/files/wireless_local_area_network.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/3080/6182/files/39136360635.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/tiempos_recios_vargas_llosa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/9654/5712/files/honey_guide_meaning_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/benami_transaction_act_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/lulugidazoramak.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_off00006096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6096 5172 bytes
SHA-256: f60fdc38fe64c8eb68c64ad73089d960668cbe651172b017ab312f604c26975a
font_01_sfnt_off00007249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7249 11376 bytes
SHA-256: 7342224d4bf086f83e02de19c8cf2a5264c2839507eb95252d04b9795192efc3

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