Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca8f34cfdcf84587…

MALICIOUS

PDF

46.3 KB Created: 2020-10-27 20:09:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 51f7b6346102d6c8d4c47e5d95d9c125 SHA-1: 281ce228526bc64c153bf9ab275b053bb6d2cb96 SHA-256: ca8f34cfdcf84587aca88838a97e8c806f147fe5d953724d352f88f8302a3ff7
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded links pointing to external PDF files hosted on disposable domains, a common tactic for SEO manipulation or distributing malicious content. One of the initial redirector URLs, 'https://gettraff.ru/strik?keyword=manaless+dredge+sideboard+guide', is flagged as malicious. The ML classifier also strongly indicated maliciousness, supporting the assessment of a link farm designed to lead users to potentially harmful content.

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://gettraff.ru/strik?keyword=manaless+dredge+sideboard+guide In PDF document text
    • https://razixolinatu.weebly.com/uploads/1/3/4/3/134384461/ff30fb897701.pdfIn PDF document text
    • https://nukubutoti.weebly.com/uploads/1/3/2/3/132302768/jelibewadowefeganu.pdfIn PDF document text
    • https://vozunutav.weebly.com/uploads/1/3/0/9/130969695/6472568.pdfIn PDF document text
    • https://koxoganonigowup.weebly.com/uploads/1/3/1/4/131408343/fetebum.pdfIn PDF document text
    • https://juporolo.weebly.com/uploads/1/3/1/3/131380745/6190186.pdfIn PDF document text
    • https://rusokupos.weebly.com/uploads/1/3/4/4/134468665/2c4e1a.pdfIn PDF document text
    • https://jilukixewe.weebly.com/uploads/1/3/4/0/134042659/zegeguritewido.pdfIn PDF document text
    • https://fupefasupemeze.weebly.com/uploads/1/3/4/3/134315788/845a2a88e7423a.pdfIn PDF document text
    • https://kirasupi.weebly.com/uploads/1/3/4/4/134442552/gemedazawaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374537/normal_5f927976728f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370273/normal_5f8dc8a3cb97f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369774/normal_5f8db1f8aa23c.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/1/0501/5126/0353/files/mercedes_b_class_electric_owners_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/5897/4886/files/3850315835.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0465/1951/7334/files/72814759541.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/network_marketing_course.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/beehive_class_9_chapter_5.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/16294846561.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f70831c-a5b1-4c8b-a84b-790264eb80ea/fawiwejod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a62c5c1-6fb9-4ac3-903a-7ce012652bcc/kejuvulitirexugisumawe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d3cea76-4800-4b67-99c2-52d1b22853bd/ripujilalebezogibezux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d51d7e6-4dbb-46a6-b06c-b8fc7154279d/jojixanesurerikezedubim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48bc13f3-eee1-47aa-a174-f3d4c811e2c9/20836030041.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_off000074d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74D0 5136 bytes
SHA-256: 5fa9e6639b3f4e7cbe8f9f3baa700a8439e29d75e777ee87b2e0ac9da484d8a8
font_01_sfnt_off0000864b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x864B 11000 bytes
SHA-256: 601a5631017a84da4d40bff1d43b6c6209e1f3965f033bb01c97c50b6e8b2497