Malicious PDF — malware analysis report

Static analysis result for SHA-256 25eaa4419bc692b6…

MALICIOUS

PDF

39.6 KB Created: 2020-10-27 06:44:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e99f08f487d20c124a4f9a154075e5d8 SHA-1: d220466acfeeddfe397726f9d4323561d7807b23 SHA-256: 25eaa4419bc692b6d9ee79f4d7285c5e6cd34d7ca556a3ff793e72eb4361f5c0
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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.com/123?keyword=servidores+kad+emule In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370092/normal_5f8b3c195451b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369323/normal_5f889f77dad11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378382/normal_5f8c86c573cae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385636/normal_5f8e932e37bad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385863/normal_5f8df9fdb80d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384482/normal_5f939d61a87d3.pdfIn PDF document text
    • https://sakukavazu.weebly.com/uploads/1/3/1/3/131379729/9176912.pdfIn PDF document text
    • https://kitarenabokuvum.weebly.com/uploads/1/3/4/4/134479912/9969826.pdfIn PDF document text
    • https://mujetuzavos.weebly.com/uploads/1/3/4/2/134266282/puxuxunigigipare.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409630/normal_5f978408ae05c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372737/normal_5f95a6a7bfdf6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378378/normal_5f9129d5c1001.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379241/normal_5f953f7d2a146.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381294/normal_5f8c1ddb6b3df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368251/normal_5f9238cc74cae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407571/normal_5f94219fbe1ac.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/zoromexemuzid/sevafenat.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/4066278906.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/jawilofif.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_off00005d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D43 5200 bytes
SHA-256: 0b95458288c899a099d3164d1fadfc75a72b8b44e6aa0a7c2831edbd2262b323
font_01_sfnt_off00006ede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EDE 10196 bytes
SHA-256: a6b1ff4b7f4f92946162b248bb31e974b01b9055de5b3094b1c2209a48f8ac37

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