Malicious PDF — malware analysis report

Static analysis result for SHA-256 bab82ad1874e4abf…

MALICIOUS

PDF

42.7 KB Created: 2020-11-06 10:15:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 9f831e8dcb8a13aba32dff40012fa4ef SHA-1: 1676ed4c6685fbb5692f912a6f89fafb5315085f SHA-256: bab82ad1874e4abf00e450cd5f5531a0a201439b192485c2bcd5905f2d9f2d1b
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://gettraff.ru/strik?keyword=area+5+njrotc In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369923/normal_5f8ec3bad7999.pdfIn PDF document text
    • https://deximuxinudob.weebly.com/uploads/1/3/0/7/130739142/kudizax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388037/normal_5f9ffb4f78d15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374857/normal_5f8a1636410cc.pdfIn PDF document text
    • https://zoxetojasag.weebly.com/uploads/1/3/1/4/131437223/3231105.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376127/normal_5f95f74926f01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366057/normal_5f887ccd4ea09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394073/normal_5f920c2c66bee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458856/normal_5fa409e4624a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391308/normal_5f91ac80e3d0c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c810fe8a-5c27-4a83-9c23-8ebe85454391/conic_sections_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b5f8131-7faa-44e3-a2be-dbbe943c5ef2/maryland_advance_directive_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/423fde54-5172-40f5-9a95-24edb2b8e8ab/41663408364.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_off00006933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6933 4772 bytes
SHA-256: 3a1d9c134ceeb60d8620d3532cbc2e20e8ac0acd5524e786b360da55b9014f38
font_01_sfnt_off00007983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7983 10884 bytes
SHA-256: fa1873f5a46cb96e9ff301186db2556314a3a5df8c7490af6a7e76f13bf000fb

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