Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f5d2ffc8d38fe19…

MALICIOUS

PDF

42.9 KB Created: 2020-11-04 23:26:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d5aa8b0cd3d99d8f3dad5cc341135a1d SHA-1: 428eec885ee8039b4abe880cd4269179425989b2 SHA-256: 0f5d2ffc8d38fe196e6ba76f5cd21638b4e6cb0f4420a80cd8966a5511becfb7
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many pointing to disposable hosting services and a known malicious redirector. This indicates a likely attempt to drive traffic to malicious sites, potentially for phishing or SEO spam. The ML classifier strongly supports the malicious verdict.

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://ttraff.ru/123?keyword=punctuation+memes+funny In PDF document text
    • https://lodirunesu.weebly.com/uploads/1/3/0/8/130874391/dapujuzuviwajom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402261/normal_5f9109e03d607.pdfIn PDF document text
    • https://nufivoba.weebly.com/uploads/1/3/4/0/134017608/4270533.pdfIn PDF document text
    • https://mojipolizu.weebly.com/uploads/1/3/4/3/134318612/2864646.pdfIn PDF document text
    • https://sedogosep.weebly.com/uploads/1/3/4/4/134486754/fed828972b.pdfIn PDF document text
    • https://xibogunef.weebly.com/uploads/1/3/1/3/131398295/9823908.pdfIn PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/9232432.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379219/normal_5f90ceb2133a0.pdfIn PDF document text
    • https://kusebedanosude.weebly.com/uploads/1/3/1/1/131163667/8051edd9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/62953455915.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_off00006c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C5E 5004 bytes
SHA-256: 1dfde95fc4856595522e256fadd0c85dae16fdc11f229107d2c78e10db4e991f
font_01_sfnt_off00007d64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D64 9912 bytes
SHA-256: 9cc4f015ae7230e4582ebfe9258f3d434a04529e663795ae8ac8ebe4a073baf1

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