Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2d6b0b083b15443…

MALICIOUS

PDF

45.1 KB Created: 2020-11-03 11:41:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 28f81f5f11d7616074d938485f89ae06 SHA-1: ffe4147f3b335f2e926116956a349534157b67a2 SHA-256: a2d6b0b083b15443a263ad5d72bf424592ac11c0cbd5b06f10f17eaac991ecdb
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to disposable hosting and redirect to malicious infrastructure. The ML classifier strongly indicated maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of links to known malicious redirectors. The document body, though heavily obfuscated, contains URLs that are also present in the extracted URL list, suggesting a coordinated effort to redirect users to malicious content.

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://cctraff.ru/aws?keyword=gw2+huntsman+leveling+guide+400-500 In PDF document text
    • https://zemodeviwiteg.weebly.com/uploads/1/3/4/3/134351550/januvimigidiwabudiji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375194/normal_5f973993e9f3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369911/normal_5f8a877951cc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377377/normal_5f8b8f298dbfb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369164/normal_5f88f053aac9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389821/normal_5f92d6089582c.pdfIn PDF document text
    • https://junoxavod.weebly.com/uploads/1/3/1/3/131384771/zezaxatefesobevukide.pdfIn PDF document text
    • https://xebikazogede.weebly.com/uploads/1/3/2/7/132740990/9165930.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374852/normal_5f8c87f2d13f2.pdfIn PDF document text
    • https://judiwufafa.weebly.com/uploads/1/3/3/9/133999980/7334370.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/jixidused.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372955/normal_5f8a9f10c455f.pdfIn PDF document text
    • https://mogezisatizate.weebly.com/uploads/1/3/0/7/130775403/basusutagutowewiz.pdfIn PDF document text
    • https://pobufulali.weebly.com/uploads/1/3/4/4/134494274/parituxu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/7915/8945/files/31699240104.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_off00007012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7012 5844 bytes
SHA-256: 5e585da22ff9b05fe3b3bdbf243dcbc3aec7bc8fde68f0d50aee247ac198238f
font_01_sfnt_off000083fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83FD 10544 bytes
SHA-256: 3dbf2ac1f49ffac6a058395c24a4c659790e100a2e94bee59755ea7234213f13

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