Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d329ae1b50bac05…

MALICIOUS

PDF

47.4 KB Created: 2020-11-07 23:36:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: ee2b66a62b9657a468a9603e58389c6c SHA-1: 13fb2ab9651f20bdbc2b48d4861ff2af64ea2a14 SHA-256: 8d329ae1b50bac05acdd9b4e2799d987e7eed8222539f57a0e46c308101a1c76
184 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to disposable hosting and appear to be part of a link farm. One of the extracted URLs, https://gettraff.ru/123?keyword=hello+neighbor+apk+fire+tablet, is identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness.

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/123?keyword=hello+neighbor+apk+fire+tablet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4378161/normal_5f913042d923a.pdfIn PDF document text
    • https://xaweworamek.weebly.com/uploads/1/3/4/6/134610398/c74738.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380393/normal_5f9981d9882d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383579/normal_5f8e92ac8ceb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370078/normal_5f96c36d6ea3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365613/normal_5f88719f8d8f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383460/normal_5f93c71ab8e1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375353/normal_5f93c3e9b63ac.pdfIn PDF document text
    • https://sukowaletudevux.weebly.com/uploads/1/3/0/8/130874669/4f995f039b959.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://waxuvemuxibi.files.wordpress.com/2020/11/96186662163.pdfIn PDF document text
    • https://direpupiwabe248790905.files.wordpress.com/2020/11/jaluzuredod.pdfIn PDF document text
    • https://s3.amazonaws.com/wejalixex/shannara_chronicles_books_vs_show.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/soletuxodomupewegosi.pdfIn PDF document text
    • https://pafegum.files.wordpress.com/2020/11/xumakosokidazok.pdfIn PDF document text
    • https://mufepokupi.files.wordpress.com/2020/11/purunagegutawesogirifug.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_off00007b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B1E 5148 bytes
SHA-256: 00b4573a7813b71469481b329553d7dd7e2965fe3bfcbd0dcf48cba670285041
font_01_sfnt_off00008c9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C9B 10628 bytes
SHA-256: ea4082dfa85356d0f26c703b61dcbcd4d34d31267f01faab0c754d4b5688ac3b

Open this report in the interactive analyzer, or submit your own file for analysis.