Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4ffaf18020d49e9…

MALICIOUS

PDF

60.7 KB Created: 2020-11-04 18:02:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: e2778c088b7a20cc1c2b5f77df3364e7 SHA-1: 3c0088f6fd66dcf43da1795cd3f3096a151ac222 SHA-256: e4ffaf18020d49e9165f85c88f901514c6da8e9f03d224b4dcf4f4a52e364be5
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains numerous embedded links, including one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to these URLs, suggesting an attempt to lure users to external sites. The presence of a link farm heuristic further supports the conclusion that the primary goal is to drive traffic to potentially harmful destinations.

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://ttraff.ru/123?keyword=saucony+pro+grid+integrity In PDF document text
    • https://tipefejiri.weebly.com/uploads/1/3/0/9/130969755/3703292.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370985/normal_5f9c6ef721c2e.pdfIn PDF document text
    • https://tilobumofiraji.weebly.com/uploads/1/3/4/4/134492377/rudupovekitot.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/vovofofaverun_sawivurovoj_nifawubazox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388274/normal_5f95be254770d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426073/normal_5f9b1eb321b35.pdfIn PDF document text
    • https://vixeregipidodig.weebly.com/uploads/1/3/4/5/134592438/b1807fd53c67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375884/normal_5f8f05b0823b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381098/normal_5fa0a2b147e76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426967/normal_5f9970a06255e.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/faluzotixupi/53233140883.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/basics_of_c_programming.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/25272005541.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/31881096665.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_off00008cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CBB 7636 bytes
SHA-256: 1f98c1400cf6585eecafb0978d814d6f1be2d4d766976f9791bdae77b8098b92
font_01_sfnt_off0000a6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA6C3 5236 bytes
SHA-256: 51fc3a2c4cb5cf771f36af119826c60e69072c974bf9d415e35201bea81cd0a9
font_02_sfnt_off0000b8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8AA 14700 bytes
SHA-256: 76b0198a7e56a880cce1a119421eb92c84746cc199cc1c638e5a45b9cf6ce9d9

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