Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7585a1bb34443b5…

MALICIOUS

PDF

57.1 KB Created: 2020-11-04 11:28:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 4b5833d176a54bbc87ba73549327f89b SHA-1: 18daff544cbcb120984d24fb6272fe07a13fcc7d SHA-256: f7585a1bb34443b5e0ac7f2e4210114dd098ae50d32c7b5b12b6317e186d880f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating a link to known malicious infrastructure. Additionally, PDF_SEO_LINK_FARM suggests a large number of external links, with one being a potential lure. The ML classifier also strongly flagged this PDF as malicious. These factors suggest the document is designed to redirect users to malicious content.

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.ru/123?keyword=chenery+middle+school+belmont+ma In PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/zolotap.pdfIn PDF document text
    • https://pasuliwipo.weebly.com/uploads/1/3/1/4/131452824/tisovexig-kowudibafo-namel.pdfIn PDF document text
    • https://zolezuborejizo.weebly.com/uploads/1/3/4/4/134444688/jelebulevuvita.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367271/normal_5f8d3a1422aba.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/e46b18ce-9759-43d1-a252-b868d83bc654/scholastic_fencing_league_southern_california.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9911d4d-d9a0-4443-92df-e67f89dde9a3/laniganirepovu.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/60429442958.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b397549-5ad2-40aa-a566-d35497e2eec1/4561422567.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a499cec7-8c46-4ede-90a5-63930ab290eb/mi_pensamiento_eres_tu_accordi.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/pemavi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/294bfbf5-c566-4846-b5cc-127336c8c76d/rotiniwowebetenut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec0d6790-eea1-4985-b5fb-25b27d94b646/thucydide_la_guerre_du_ploponnse.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/el_bosque_seco_tropical_en_colombia.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_off000091fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91FE 5324 bytes
SHA-256: 7dfc00a2f66e066c97198bdc245241ff58df3b95114ccf4997d6fe85cc619d0f
font_01_sfnt_off0000a3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA3EB 16548 bytes
SHA-256: befd560087034682565627bd0fd6da21f16afc0c976e67e78b0d4f80bcb45489

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