Malicious PDF — malware analysis report

Static analysis result for SHA-256 771e165ba3223f68…

MALICIOUS

PDF

42.7 KB Created: 2020-11-01 00:12:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 44fe0d08ad0f2f1be094c15a57a4ecb7 SHA-1: 19ff94899c24e6444e7e16223cfdd69fc59a565d SHA-256: 771e165ba3223f68ddba0f089e574dc7da5805c3772574f084e0aad918d3a8ba
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.club/123?keyword=the+second+arrival+1998 In PDF document text
    • https://gusumadanu.weebly.com/uploads/1/3/2/6/132695601/mowitulagaxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366653/normal_5f87b27aa4e1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409827/normal_5f9dc97e11526.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367944/normal_5f99037450333.pdfIn PDF document text
    • https://sitizoxibe.weebly.com/uploads/1/3/4/3/134317871/23eac23237f9f.pdfIn PDF document text
    • https://kuzewejutoba.weebly.com/uploads/1/3/4/3/134398832/1424699.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408702/normal_5f939b018a1ee.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://uploads.strikinglycdn.com/files/ee43736d-882a-47e2-bdec-124dae5b9caa/xawaxafupelilaxeso.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/5332/1887/files/38456269899.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/17401452613.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E21 2828 bytes
SHA-256: f1383d7cd59a6739427f7596f1165603adacbacc8f657d4e156367611f565abb
font_01_sfnt_off0000582a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x582A 5148 bytes
SHA-256: 39609218acaac9b70ccde39243aa7031e66d12f80f3cd6bca3d0604105ab77f2
font_02_sfnt_off00006992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6992 11500 bytes
SHA-256: ad48cb1d3ee2438862428fe1d739dc4284366878ddfdcbacb4a850db6d0ba79e
font_03_sfnt_off00009022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9022 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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