Malicious PDF — malware analysis report

Static analysis result for SHA-256 a86a59e95566f847…

MALICIOUS

PDF

39.5 KB Created: 2020-11-05 02:08:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 055abe41d9107a1c5625025fcc57c8de SHA-1: 384956859d50b63f89929506a699aa3fd10cd67b SHA-256: a86a59e95566f847677fc46b6857089df9d47cb1f08f392a1e48d885da7a58a5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for a 'Spanish verb cheat sheet'. The presence of a malicious redirector and a link farm suggests an attempt to drive traffic to malicious sites, likely for phishing or malware distribution.

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 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.
  • 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/aws?keyword=spanish+verb+cheat+sheet+pdf In PDF document text
    • https://tifedufuzitiji.weebly.com/uploads/1/3/4/3/134353288/koborerexobizujilaja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402938/normal_5f920c4a71b5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413243/normal_5f97dd90ba337.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/851eec5f-a6af-4c4d-b417-adae99d1ffbd/fulegunupipagisupopusu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b6b1595-02e3-49ed-b237-af047a39038c/96975348022.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a23eb38-f0f2-484b-89cc-e902a53691fd/ziperugotajibal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5beff821-69ff-4c9c-87b3-3f72aa481306/40184315178.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e77782c-45de-4992-be57-31b5bf152d34/sebuwilewonudusoxeve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41d32327-3d17-4abf-97a9-2d7e506cf69a/nepisan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb484a02-936c-4304-98be-29bae83279de/71733124952.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cee2829-7ea7-4134-8190-357c078c40dd/latunufujivinil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e5756ae-4af7-4872-b34c-73e0aab77bde/dosazukidolideloladul.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_off000056aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56AA 5516 bytes
SHA-256: edf8d5de2902241a51441058fb0d2d75c587cef2ea9da583b1bb6e914c286757
font_01_sfnt_off00006960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6960 14368 bytes
SHA-256: 3b235b96eca5c5abcae3f6f4e527762c3ce09a3fed55c5bde38448732459aaaa

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