Malicious PDF — malware analysis report

Static analysis result for SHA-256 c087dec7d7270028…

MALICIOUS

PDF

42.6 KB Created: 2020-10-28 01:59:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 887da97a88341813f43dd8ea55e2268c SHA-1: 90f6e72a88dba2508ae7250d1995415d0b156ad2 SHA-256: c087dec7d72700282c908cae51743172a83443681a360c3fda3afb176a156539
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains multiple embedded links and impersonates the Walmart brand, strongly suggesting a credential phishing attempt. The links point to redirector infrastructure, which ultimately leads to malicious sites. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://vaxeratomox.weebly.com/uploads/1/3/4/3/134397216/c685609184607.pdf.
  • 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://gettraff.ru/strik?keyword=what+is+socratic+irony In PDF document text
    • https://cdn-cms.f-static.net/uploads/4404503/normal_5f969278e0c6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369786/normal_5f924f71cbec3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366632/normal_5f93389eebe86.pdfIn PDF document text
    • https://vaxeratomox.weebly.com/uploads/1/3/4/3/134397216/c685609184607.pdfIn PDF document text
    • https://zijovegumasapal.weebly.com/uploads/1/3/4/3/134307166/gemoponaliv.pdfIn PDF document text
    • https://vewusijonaw.weebly.com/uploads/1/3/4/4/134489037/jikisideme-mozefixuluf.pdfIn PDF document text
    • https://mipirizu.weebly.com/uploads/1/3/2/6/132682564/pomilezizolibo_kitarusatibu_seren_loxufagezir.pdfIn PDF document text
    • https://segakimorepej.weebly.com/uploads/1/3/0/7/130738797/171491b392244d.pdfIn PDF document text
    • https://sadoxeliwuduw.weebly.com/uploads/1/3/4/0/134040540/6e07846b35711.pdfIn PDF document text
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/8a3a7d01008d78.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wilugugo/xegabizuwapubonoz.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/wavugubatabote.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/active_and_passive_voice_worksheets_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/15411114233.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9579f0c-a867-4883-807f-52072942bb1d/62513012883.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caf38c65-bf94-4bfe-bbbf-dd547176f5fb/95890900573.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fe171f3-5dd6-49e8-9f52-7eaf0735fe23/tuviwesinimikusepi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05a0368d-28f1-415c-bc5d-5de715c84449/tasegofafobasilabofixeti.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_off00006647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6647 4972 bytes
SHA-256: 9a286bb31f2dd83bd9845d654fded7ec4ce9db46a090491ebdc526812ad3eed1
font_01_sfnt_off00007733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7733 11184 bytes
SHA-256: 620375ce98162be44a6367d9d9f58e8e78dc5d20db8eb1a8161b98a1338e7f01