Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a503f0729e0d06b…

MALICIOUS

PDF

44.2 KB Created: 2020-11-04 07:51:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: bcf9a4968298c7dfa6182e874bd03fd4 SHA-1: 984e932063ace8938ac50fc3e1e46098a5f2094e SHA-256: 3a503f0729e0d06b7ecb361175ccfa30ed9ed06b57387aec1618545e84947ffb
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded links that redirect to known malicious infrastructure, specifically advertising a "free amazon gift card code generator". The document body, though heavily obfuscated, contains references to these lures and URLs. The ML classifier strongly indicated maliciousness, and the presence of redirector links suggests an attempt to download a second-stage payload.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=free+amazon+gift+card+code+generator+2018 In PDF document text
    • https://kutesavakelex.weebly.com/uploads/1/3/4/3/134336058/darol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446491/normal_5fa111765c32f.pdfIn PDF document text
    • https://vafumigoku.weebly.com/uploads/1/3/1/3/131384305/3177289.pdfIn PDF document text
    • https://xikemusuvef.weebly.com/uploads/1/3/4/3/134322181/lenamomoju.pdfIn PDF document text
    • https://rimesozarabef.weebly.com/uploads/1/3/1/6/131607712/59e18c2f1d0bf5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419818/normal_5f9ae147c2d2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378605/normal_5f91340e08184.pdfIn PDF document text
    • https://debemalimuwu.weebly.com/uploads/1/3/4/3/134385929/depoka.pdfIn PDF document text
    • https://kofejadadamutu.weebly.com/uploads/1/3/4/3/134348877/21191e0e612ebcf.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/tugumeb/libro_fisco_agenda_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/vorilabud.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/16231116898.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/8th_grade_science_staar_review_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/zixenebi.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/john_milton_poems.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_off00006c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C57 5656 bytes
SHA-256: 689485f94da34a7496f00f0e73f5f2e3324e8266c59f5fe00b813d97c677772a
font_01_sfnt_off00007f8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F8A 10544 bytes
SHA-256: 55f48ed9b8f211fba97197ee16f0cce2e63a632f9f53fab2a0a51ae713aede84

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