Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed535b7cef29ece6…

MALICIOUS

PDF

33.3 KB Created: 2020-09-17 16:39:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 92b3a0870a0de20d28e4a7ca7677e28f SHA-1: a4d94dff6bcf2de42f15776fcae9d15bd652d372 SHA-256: ed535b7cef29ece6fd6104887e94a98a47cfebcf9e0a678ca4f42847b8693acd
224 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one identified as a malicious redirector. The heuristic firings indicate the document is structured as a link farm, likely for SEO manipulation or to distribute further malicious content. No scripts were extracted, but the presence of a malicious redirector and a large number of external links suggests a phishing or content distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.me/wix?keyword=jebao+submersible+pump+pp+333 In PDF document text
    • http://files.remodelingbymartinbrothers.com/uploads/1/3/1/4/131406749/132055.pdfIn PDF document text
    • http://zugipev.karmenkooyers.com/uploads/1/3/0/8/130873995/f8681d2.pdfIn PDF document text
    • http://gopekides.shanghaitradelink.org/uploads/1/3/2/6/132681670/ce528da0.pdfIn PDF document text
    • http://files.arizonaclay.net/uploads/1/3/1/4/131453967/nimododosifevo-kuwexig.pdfIn PDF document text
    • http://tagizom.northwesthennepinfamilyservicecollaborative.com/uploads/1/3/1/3/131379117/4130906.pdfIn PDF document text
    • http://beduzupa.leasemanagement.com/uploads/1/3/0/9/130969037/2204507.pdfIn PDF document text
    • http://files.nicholassearle.com/uploads/1/3/1/4/131437612/toditidufox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://de86da57-2a5f-429d-a7da-1bc3256a3f70.filesusr.com/ugd/cc15ef_b9ad2d1409ed4ecab834b18d75d74fbf.pdf?index=trueIn PDF document text
    • https://c79b6311-7e37-4ca1-84f0-2667f938a843.filesusr.com/ugd/4dd980_1ab46a0dc3964f7fb7f3e511273a8b72.pdf?index=trueIn PDF document text
    • https://5ad87b74-8b22-4c40-9fb2-231e3fec1758.filesusr.com/ugd/3e5db3_a8ce9c898a004128997125b5f385c3a9.pdf?index=trueIn 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

Related samples 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4430 5260 bytes
SHA-256: a9541c2a860dd23e1563a57c2e207b4ec16f4766d27906b9f7e89224cab7ac3a
font_01_sfnt_off000055f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x55F4 10164 bytes
SHA-256: 8f5d09c7f8228bd0ddc3c25b8b004b296c6a12a57c87f0874c43d9ddd5172f09

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