Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d552dce2042651f…

MALICIOUS

PDF

42.9 KB Created: 2020-10-29 21:54:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: dfb5a927bd58c85e662702a1995bd6f3 SHA-1: 914d7a49e87e1caa5fac79d6ac3f975631790868 SHA-256: 7d552dce2042651fd78e6e0cac5bd9218ddefc471ac85ae9a0a4106e1f66a8fa
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.link/123?keyword=boise+bus+route+4 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4378152/normal_5f8a27beddbd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381528/normal_5f8b74f47418f.pdfIn PDF document text
    • https://sujibume.weebly.com/uploads/1/3/4/4/134442643/budirumesisadukutu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369302/normal_5f9727b8afb5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368759/normal_5f90d97070bc9.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/600acc4c-5081-4274-a129-9af3dd899ca6/79825745096.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50865837-719a-41c8-a9a6-c4fd68f4b779/66783419929.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18f50a8b-2d4c-408f-a74d-cad51a4d2f33/mekoropuwapalojinoluvebi.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/sixizerawovilataredeno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/735487bf-b0d1-4c04-84b1-78b8b6ac20ad/mientras_que_por_competir_con_tu_cab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f55f6716-00fd-4f99-9473-144302e94dbb/defense_attorney_salary_florida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d34f09d-3389-4bdb-9b07-b7a52369b648/thor_ragnarok_release.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0ac9fd7-b6e0-4eb6-8cba-67bafc916ce2/kanna_nee_thoongadaa_mp3_download.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_off00006958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6958 4716 bytes
SHA-256: 2189e6548dd9af8f43f64eed95e82fd452f877181e9031732329a8f3190b0fb5
font_01_sfnt_off00007978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7978 11148 bytes
SHA-256: f3c4581330451296b3e60145c66e909486043dbdb9f0dd7e82f08c601388cb3e

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