Malicious PDF — malware analysis report

Static analysis result for SHA-256 612da4d9482cbc1a…

MALICIOUS

PDF

36.2 KB Created: 2020-11-08 04:27:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 07a25794b3c1bf33019a97c981557b2f SHA-1: c89569dde1f89155b17f4c679d95d66e5666e818 SHA-256: 612da4d9482cbc1a95edc887c441b7bc4599b30d1270ff2ae11c2a25ae06a017
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that point to a known malicious redirector. The document body, though heavily obfuscated, includes URLs that are part of a link farm hosted on disposable infrastructure, suggesting a phishing or redirection attempt. The ML classifier also strongly indicated maliciousness.

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 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://traffking.ru/123?keyword=practical+computer+literacy+4th+edition+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4413590/normal_5f94869301941.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375885/normal_5f8d5968746d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375086/normal_5f8d4644a02fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470685/normal_5fa4645bf15dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404488/normal_5fa2fa395a3df.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/temujonuwu/pafasaj.pdfIn PDF document text
    • https://sapifotad.files.wordpress.com/2020/11/ripesivifo.pdfIn PDF document text
    • https://wuragel.files.wordpress.com/2020/11/baixar_o_livro_em_busca_do_tempo_perdido.pdfIn PDF document text
    • https://vuworopa.files.wordpress.com/2020/11/disizutozogazap.pdfIn PDF document text
    • https://fomotorunow.files.wordpress.com/2020/11/widajuvugel.pdfIn PDF document text
    • https://s3.amazonaws.com/suxiweke/33788897742.pdfIn PDF document text
    • https://wepigun.files.wordpress.com/2020/11/83809309894.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/89795711680.pdfIn PDF document text
    • https://zujipigibud.files.wordpress.com/2020/11/52_lists_project.pdfIn PDF document text
    • https://tugulix.files.wordpress.com/2020/11/so_too_either_neither_exercises_with_answers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000443e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x443E 5292 bytes
SHA-256: 7e799ce68ceb995cf00ff4a7a70bf8fc9dd3c20997b64d7036c1cd36196d07ca
font_01_sfnt_off0000560e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x560E 9308 bytes
SHA-256: e37eb38395a2c5bb4dc5d759340dd63b858feb0c730b38c74d31982060b99711
font_02_sfnt_off000075cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75CD 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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