Malicious PDF — malware analysis report

Static analysis result for SHA-256 b15b50b5fa232f9f…

MALICIOUS

PDF

48.2 KB Created: 2020-10-12 07:32:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 960f34a427a8e0c5cce8369a9cb08705 SHA-1: ce4e1465f253e5a301f45e135f43aca0be4d229e SHA-256: b15b50b5fa232f9f3ccedec5cb5c5a7759005d3ca6b97c4a64f60b3dd742ab4f
184 Risk Score

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://cctraff.ru/pify?keyword=the+arrangement+of+keys+on+a+keyboard+qwerty+reflects In PDF document text
    • https://site-1048220.mozfiles.com/files/1048220/61166517771.pdfIn PDF document text
    • https://site-1043403.mozfiles.com/files/1043403/6503527625.pdfIn PDF document text
    • https://site-1043098.mozfiles.com/files/1043098/dufox.pdfIn PDF document text
    • https://site-1036980.mozfiles.com/files/1036980/5609743119.pdfIn PDF document text
    • http://files.hclleapcommunity.com/uploads/1/3/1/6/131607522/760b69cbac7.pdfIn PDF document text
    • http://files.townofwillsboro.com/uploads/1/3/0/7/130739740/8571779.pdfIn PDF document text
    • http://pigoz.simonperathoner.com/uploads/1/3/2/3/132303054/3546616.pdfIn PDF document text
    • http://files.chloeneast.com/uploads/1/3/1/3/131379987/bitor.pdfIn PDF document text
    • https://site-1038451.mozfiles.com/files/1038451/33738375445.pdfIn PDF document text
    • https://site-1043033.mozfiles.com/files/1043033/33624362895.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/1bcc7a80-7d42-4ea3-81c1-a12c057b0eab/63134119694.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7aa65137-489a-43ad-84c4-9ca0f6759f76/gijejilomexobufiparima.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25c1404d-392a-4933-a574-1f7cf4beff8e/kabesamexowulel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e86331c-a169-466b-aea5-d12220da5bc4/vivesivazoligatixebamifeg.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64F3 5908 bytes
SHA-256: 88a542b784c04ce576213ec6b3a4500fd69d8009377a7d7f39755ad20adc8e0b
font_01_sfnt_off000078f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78F3 10168 bytes
SHA-256: b5c61bbc300532d12c2f6b88d837bc1d05df005ab2464b9ca0a1aebf48558310
font_02_sfnt_off00009ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BA4 16792 bytes
SHA-256: 0b557b3f7491e5cd5a93fb889fe99ac3ddc0624b84182dd7f4e05993d2fc1105

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