Malicious PDF — malware analysis report

Static analysis result for SHA-256 93987b2d799c0c4d…

MALICIOUS

PDF

103.7 KB Created: 2020-11-07 11:17:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 5c3b949f6ca0033a10d4ebfb3c8ef0ab SHA-1: 1cc53ada2ea443701bbbb1c8d9dd25e7fb3cff73 SHA-256: 93987b2d799c0c4d098a1fd78a07503b32539bdc740d20c6c485fd04c1eb3745
184 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting and redirectors, indicating a link farm designed to drive traffic to malicious sites. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://gettraff.ru/123?keyword=windstream+tv+guide+listings'. The ML classifier strongly supports the malicious nature of this PDF.

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=windstream+tv+guide+listings In PDF document text
    • https://dibekepoxifepef.weebly.com/uploads/1/3/4/5/134587143/fadapovorer-zikeg-wiwimojadebe.pdfIn PDF document text
    • https://welofubevi.weebly.com/uploads/1/3/1/8/131856084/c6d7a4f7b729537.pdfIn PDF document text
    • https://sizukejagu.weebly.com/uploads/1/3/2/6/132681884/sexogimejapove_jetani_papugu.pdfIn PDF document text
    • https://defagetomorig.weebly.com/uploads/1/3/4/5/134576552/dogowabob-xekexobavog-tebizujazagivas-zudupewuza.pdfIn PDF document text
    • https://xidekudogigut.weebly.com/uploads/1/3/4/6/134683706/6749480.pdfIn PDF document text
    • https://vomediwanuxorat.weebly.com/uploads/1/3/4/3/134327005/denudazevarogilolavu.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/2acccd9f-06c2-464e-a021-f78e6bbbe0b4/sajunajolulezimolo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dd00f1e-1d15-4488-a17a-cb6cdd308a04/burke_williams_gift_card_promotion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a40bc72-f5eb-4e3f-8db0-fdfe33918099/cubic_functions_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/095da9a5-e7f3-4b33-9288-35e3eda333ad/20305857507.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d144caff-1b0d-4c48-b5d1-ca280d19f4ae/83554525013.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a9157f6-473e-457c-945c-41a18b5541f2/geographical_example_of_possibilism.pdfIn PDF document text
    • https://lovubigizimu.files.wordpress.com/2020/11/lvnement_annie_ernaux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42ab4982-4d84-4dca-a7b2-896775f22803/implementing_domain-_driven_design_p.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_off000156a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156A4 5220 bytes
SHA-256: a779ec1475a228daaa3e4d49c139aef6893d016e9fd52d6a7ede03c1947bf2d2
font_01_sfnt_off00016860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16860 12844 bytes
SHA-256: 1c59410662c142d19bcbdf1372466c9af66ed4a7b03f79059d9eaaf9a195c30c

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