Malicious PDF — malware analysis report

Static analysis result for SHA-256 9310f9254d74f93e…

MALICIOUS

PDF

38.3 KB Created: 2020-10-09 00:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f039ca6f5996d351aa027b2441c38f13 SHA-1: 6a19e14e8c9e62851d4e9d2061f7aa8eed185a9d SHA-256: 9310f9254d74f93eaa81ffcb1ffb436470077473fbb3c7908dc01ac394728af7
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files hosted on disposable domains, indicating a link farm or SEO manipulation scheme. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a potential distribution point for malware or phishing content. 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/pify?keyword=cine-kodak+eight-25+movie+camera In PDF document text
    • http://files.conventionwma.com/uploads/1/3/1/4/131438164/kuxuvumolozisumik.pdfIn PDF document text
    • http://goxebu.florida-oa.com/uploads/1/3/0/7/130775971/pojesoguni_fozusu.pdfIn PDF document text
    • http://files.hhupholstery.com/uploads/1/3/2/7/132740234/0ee45af8e15.pdfIn PDF document text
    • http://files.aestheticon.com.au/uploads/1/3/0/8/130874583/mijixa.pdfIn PDF document text
    • https://site-1043752.mozfiles.com/files/1043752/77657332326.pdfIn PDF document text
    • https://site-1036743.mozfiles.com/files/1036743/56698800920.pdfIn PDF document text
    • https://site-1039163.mozfiles.com/files/1039163/13354474256.pdfIn PDF document text
    • https://site-1042776.mozfiles.com/files/1042776/pojikeg.pdfIn PDF document text
    • https://site-1037073.mozfiles.com/files/1037073/57777771829.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/745dd44a-c730-4da2-ac80-6b988e98c7e6/46350413522.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/588c5a84-911f-4d17-aca1-60a374445f6b/makuwiferolenatigidoxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c2cbc7a-a674-46bb-bfed-146569f10945/tajevokig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfdb0d90-63f9-43a2-881f-28aab694d505/28869200065.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f402953f-b1ac-40d5-8f58-3223b87ae749/lakemovovojobawima.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ed17701-9c04-4907-92ee-7796a1593860/tubujenofedoxuduremalu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6af59747-302e-4748-8934-6cab72b75c0a/lavalovefatuk.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_off00005749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5749 5460 bytes
SHA-256: cf8474c32b98e28313e616f9dd33ca411304e750dd7dd8b6706d0a4c0318941e
font_01_sfnt_off000069c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69C6 10368 bytes
SHA-256: 087f3270c02a43bad95485cd3e2d9770284dd60ace196a59efb9c0c4c633f2a1

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