Malicious PDF — malware analysis report

Static analysis result for SHA-256 7630c2d3caa6ddae…

MALICIOUS

PDF

102.8 KB Created: 2020-11-01 04:48:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 055211246077fc26287a2242ed3a1e21 SHA-1: bfb67f25f7188efa63fddf25e5f7dc62dc42d3e1 SHA-256: 7630c2d3caa6ddaecedf2e252e12c7fd4a4229faf7519420a7eba7d451027a19
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=epic+skater+apk+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366969/normal_5f8dbd6abe4b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368952/normal_5f91f49919d76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375088/normal_5f8a1fd314505.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368474/normal_5f8c3c03c34fb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7932/8436/files/40817282124.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5537/3720/files/microprocessor_8085_by_ramesh_gaonkar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/248f89e4-f111-4ee4-bb64-bb7e09ef7eaa/mixiseveboxopepajozagol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/536b3ac6-d289-445c-a4f5-beba30daa6c7/98526786800.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/830c4e41-66d4-4706-a039-22719958ffff/componentes_del_proceso_de_enseanza_aprendizaje_wikipedia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b858fb43-14df-4c0d-ba54-3baed27ff7c5/eso_drain_health_poison_ix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/926334c0-42b6-44fc-b67f-7af47d012c3f/61843845554.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_off0001578c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1578C 5180 bytes
SHA-256: 857b34aeb6998249627753e9438f32acc68391d6e6e7a20677b0ddac3f65f81d
font_01_sfnt_off00016956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16956 11136 bytes
SHA-256: 1610cd8c735770489d3b89537486bd4b5156f0234dc582252d761b775feaff1a

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