Malicious PDF — malware analysis report

Static analysis result for SHA-256 218e3450b6476128…

MALICIOUS

PDF

36.6 KB Created: 2020-11-05 08:48:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d03b528ce3309ed3cbb4a3a966e76693 SHA-1: 9b3a109ddb84bf3bc95e5f1600e9969be4e65031 SHA-256: 218e3450b6476128f6f6613effebb191a0ecc98bf98f279ebf45e16a131559cc
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that redirect to a malicious domain, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though obfuscated, contains a URL that matches the malicious redirector, suggesting an attempt to lure the user to a compromised site. 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://ggtraff.ru/aws?keyword=kung+fu+massage+tucson In PDF document text
    • https://cdn-cms.f-static.net/uploads/4388815/normal_5f91875335d63.pdfIn PDF document text
    • https://zegojipoxe.weebly.com/uploads/1/3/1/0/131069766/dodibadunejonus.pdfIn PDF document text
    • https://nalabusapigo.weebly.com/uploads/1/3/2/7/132740218/bafetivefu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368975/normal_5f8a534e5af64.pdfIn PDF document text
    • https://wojedebaroz.weebly.com/uploads/1/3/1/6/131637691/1890e4488695f.pdfIn PDF document text
    • https://wetuxabo.weebly.com/uploads/1/3/0/8/130873937/f89f52353f3.pdfIn PDF document text
    • https://vuxarujetununo.weebly.com/uploads/1/3/4/4/134437765/kaxenutulasaw_kitotuwejerukak.pdfIn PDF document text
    • https://gowumobajakexe.weebly.com/uploads/1/3/4/5/134585768/wulanunawakugin_badiled_giwov.pdfIn PDF document text
    • https://menelaxewo.weebly.com/uploads/1/3/4/3/134362368/linejuxowaxol-dazego.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/ef83b42b-06ad-4894-8031-ef842e90714d/lenekunewovagekivusum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e88f1c10-5009-4df5-971f-fe23e1f0fc9b/rilokudavobob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55566521-6519-4f77-a4ff-21050c33e9fa/rupenuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/4300/3807/files/dex_cool_antifreeze_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b0bcb86-1c10-42a0-962b-f2ee09b4edcf/7358012389.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/689fa152-905b-4576-8b3d-af4f90eacb29/xusekuzodemumed.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_off00004fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FCD 5044 bytes
SHA-256: 3c829dd68180d51c3c637478b8d153280457adcb944a68b4118d05fd8cbf7ac8
font_01_sfnt_off000060f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60F5 10736 bytes
SHA-256: 610790339e742641ed72f9c901762be15f77e4a72142578678c8fe5bd77db254

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