Malicious PDF — malware analysis report

Static analysis result for SHA-256 93aa8b2f28828828…

MALICIOUS

PDF

52.0 KB Created: 2020-11-04 05:27:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: edc3ca0d636550f8d1f8bc127b57d70d SHA-1: 16bd1655de7b48f3cafcb938d80c1f0cac88923b SHA-256: 93aa8b2f2882882873e4f0956f29c5cb13d1103f3c703f19725e6dd8c954bb82
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, with one identified as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting a tactic to manipulate search engine results or distribute malicious content. While no scripts were explicitly extracted, the nature of the embedded links and the ML classifier's high confidence point towards a malicious intent to redirect users to harmful sites.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=timeline+of+jesus+ministry+and+miracles In PDF document text
    • https://tixosame.weebly.com/uploads/1/3/4/5/134523113/8667380.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379220/normal_5f9dc693184bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384325/normal_5f8c113a353eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377931/normal_5f9cd35353313.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447250/normal_5f9eb74f50634.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374957/normal_5f8a8605555ce.pdfIn PDF document text
    • https://rexolofozex.weebly.com/uploads/1/3/4/3/134368018/zivof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375204/normal_5f8f3e5da0a03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365542/normal_5f8706cb8e032.pdfIn PDF document text
    • https://zadumeredevasax.weebly.com/uploads/1/3/1/4/131453870/lupozatos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412908/normal_5f9c8275ce6dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422378/normal_5fa20f4aea0c9.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://cdn.shopify.com/s/files/1/0483/4662/8259/files/tapisewitejurabekop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f974438-e0a0-461a-8dfc-851101461c40/biregularowofagu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdb98953-fc22-4e38-bc69-2c9bb4fc07f9/ritedifegabunolip.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_off00008057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8057 5176 bytes
SHA-256: b93c40598f1ca623415e2e65149225980988b934f21f45550895c275ffcc9c06
font_01_sfnt_off000091d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91D9 10496 bytes
SHA-256: 6e6e6698524db57a79bb83ebbce6418babf26434ee9e29c3f9aa78ffa691516a
font_02_sfnt_off0000b518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB518 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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