Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a2528d00fa9fd34…

MALICIOUS

PDF

49.0 KB Created: 2020-11-05 08:33:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 05b3055c559087ab1549002973d0f2c4 SHA-1: 70c0e55c9d9cb370d8ad07dcde71bbbb3c632847 SHA-256: 9a2528d00fa9fd34ee20e2f95b5e4d84fe9120fd63a938944bb422ce051edcf1
124 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the one identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. This suggests the document's primary purpose is to lure users to a malicious site, likely for further exploitation or phishing.

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://ggtraff.ru/strik?keyword=arrhenius+vs+bronsted+lowry In PDF document text
    • https://kokexofagisukop.weebly.com/uploads/1/3/2/7/132710589/e0f9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379374/normal_5f8d42ec7a8db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365657/normal_5f958e6145fc5.pdfIn PDF document text
    • https://riwisasivituw.weebly.com/uploads/1/3/1/0/131070703/jubugowozozun_jekupoguzewox_jotawesala.pdfIn PDF document text
    • https://fupexorugukemig.weebly.com/uploads/1/3/0/8/130814763/bonemezukogedit-pawobelibepilev-pevive-bironofugave.pdfIn PDF document text
    • https://ditiwudo.weebly.com/uploads/1/3/1/4/131452947/falitaterajozesowus.pdfIn PDF document text
    • https://lawaxiwutaf.weebly.com/uploads/1/3/4/3/134356413/cff28d8eb451f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383806/normal_5f99baeb69515.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/sedimeraxufi/29123160370.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/0541/4045/files/4568815242.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bed34ed-976d-4209-922c-538ac1ba0e0d/bogagorugawidivelaseturof.pdfIn PDF document text
    • https://s3.amazonaws.com/giwurode/making_inferences_worksheet_grade_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d39edbc-e120-40ec-9d70-646ae50b2928/80051131262.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/2265/9996/files/53267703285.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/pitching_machine_motor.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_off000072cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72CB 4968 bytes
SHA-256: 81e5faa485340ec09b398ab7ae872193068358aba3a4b654c782a96a3281d767
font_01_sfnt_off000083b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83B7 10988 bytes
SHA-256: 98c3615a87381616fb7e1a1e7903553d4625f5ddf824942472e51eee7eb95656
font_02_sfnt_off0000a900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA900 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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