Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d017b983528a17e…

MALICIOUS

PDF

33.6 KB Created: 2020-10-31 00:49:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 428de6e37e370d28230c6e97b3527789 SHA-1: 3129eff0aafba2b32309e4128393da98788c966d SHA-256: 8d017b983528a17e3f4c54ca0b1e178d3817aedf037404567ee14e70999e0df6
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded links, with one specifically identified as a known malicious redirector. The document body, though heavily obfuscated, contains URLs that are also present in the heuristic findings related to link farms and disposable hosting. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves directing users to potentially harmful external websites.

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 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://cctraff.ru/123?keyword=similes+in+lord+of+the+flies+chapter+2 In PDF document text
    • https://fevuxutub.weebly.com/uploads/1/3/4/1/134131759/99359d9c2.pdfIn PDF document text
    • https://kavaxaxogemiren.weebly.com/uploads/1/3/4/4/134441995/puwifi.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/e0f292.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369645/normal_5f89ba331bdf2.pdfIn PDF document text
    • https://radutarogo.weebly.com/uploads/1/3/4/3/134379411/889e9ca482fa1bf.pdfIn PDF document text
    • https://besavikeneg.weebly.com/uploads/1/3/2/8/132815808/21e75.pdfIn PDF document text
    • https://finivoxub.weebly.com/uploads/1/3/4/3/134387593/156736.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/d0602934-525c-4eb3-a719-4d3c47a49632/58085866857.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6137cfc-b166-41bf-8f36-3c698d3fa8dd/arqueologia_del_saber_completo.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/csce_145_jj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb043b1b-480f-4b96-b13d-3a5e0a3f47a4/65066092905.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/accelerated_mobile_pages_tutorial.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

Related samples 8

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_off00004551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4551 5628 bytes
SHA-256: 5848ad9caaaae34b8f1c734b2caf3f19534b1cd13d19a7d09dccee9f820f8f26
font_01_sfnt_off00005852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5852 9816 bytes
SHA-256: a3e9298490e16d86101fa4df6245cfcc69cccdc69a866f297b43e1d70b95b6ce

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