Malicious PDF — malware analysis report

Static analysis result for SHA-256 42a499f6cd3a0196…

MALICIOUS

PDF

48.0 KB Created: 2020-10-01 04:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 31ae686d4c19175cc9a5cd1e4e417437 SHA-1: e77344d44bbb03ee8e91780fe4c7a7cbd2739c6c SHA-256: 42a499f6cd3a019628ab776116c30b59da51a438bc29dbf031ffee4e07316774
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The document's structure and link farm characteristics suggest it's designed to lure users to external, potentially harmful sites. 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://ggtraff.ru/strik?keyword=les+analyses+physico-+chimiques+de+l%2527+eau+potable+pdf In PDF document text
    • https://site-1036678.mozfiles.com/files/1036678/50008058898.pdfIn PDF document text
    • https://site-1037177.mozfiles.com/files/1037177/sesezodabalu.pdfIn PDF document text
    • https://site-1038455.mozfiles.com/files/1038455/24029589702.pdfIn PDF document text
    • https://site-1039689.mozfiles.com/files/1039689/73661948825.pdfIn PDF document text
    • http://files.drhusband.com/uploads/1/3/1/4/131406391/da5235a7beeb.pdfIn PDF document text
    • http://files.shorespices.com/uploads/1/3/1/4/131405977/sefopu-moximenedifu-suduvanukeveto.pdfIn PDF document text
    • http://files.foschia.ca/uploads/1/3/1/6/131607010/getip.pdfIn PDF document text
    • http://files.ghostlightnepa.com/uploads/1/3/1/3/131383333/5141710.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/8950b0ac-332d-4a83-b1c0-065dcd2eb1a8/fazefunimarazamosimip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26086a3b-40a1-49bc-a3eb-c5d95a52f1cf/furerimejewefomi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc7cdedf-af9e-42d2-984e-1d0a1f1b6fd0/xokirujuru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa860103-3882-4d82-8c3f-610ff1deb7d5/molafisodiwokemenim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1eca183-17ba-4748-bbf3-814e38ca47c5/bojivedep.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2881/5783/files/59805520352.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6802/2172/files/najebalonupo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6346/6391/files/44197156369.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72890356131.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2929/0390/files/euphemism_worksheet_grade_5.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_off0000782c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x782C 5676 bytes
SHA-256: 6a51520f069ec43dd64186359710d7c4ad900b470bd0d4fb56e36a08425ca082
font_01_sfnt_off00008b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B69 12060 bytes
SHA-256: 98b14d624a86a70cba0400f46aca6843339f5dfd6f741ebaa30650b945f7c70e

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