Malicious PDF — malware analysis report

Static analysis result for SHA-256 7149088b39f1a100…

MALICIOUS

PDF

38.3 KB Created: 2020-10-04 23:30:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 748c3af09923c041838e89580db9ced0 SHA-1: 3e571115301f40e21559a20e47558bc93c897750 SHA-256: 7149088b39f1a100d34d2328740ec71b1e4f2d60ce1cb3b7fa4536e7ef4cdbfb
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, one of which points to known malicious redirector infrastructure. The document also exhibits characteristics of a link farm, with numerous embedded URLs, suggesting an attempt to distribute malicious content or engage in SEO manipulation for malicious purposes. The ML classifier strongly indicated maliciousness, supporting the assessment of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cctraff.ru/strik?keyword=improve+your+ielts+listening+and+speaking+skills+%255C%2528pdf+2cd%255C%2529 In PDF document text
    • http://files.highlandlynxdunord.com/uploads/1/3/2/7/132741269/wemubib_repinifekomo_lejujapegov.pdfIn PDF document text
    • http://botepimuf.ethanemersonmusic.com/uploads/1/3/1/4/131452893/tatapapasixep.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/1/0482/1532/6877/files/emporia_state_university_library_catalog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0454/7362/8326/files/34289854822.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/4280/2330/files/floor_hockey_study_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4017/7314/files/22127552932.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2359/7725/files/temijojujojoxe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4727/2098/files/michael_baron_probability_and_statistics_for_computer_scientists_solution_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6381/1999/files/himno_nacional_de_honduras_completo_con_explicacion.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/0053/9554/files/84217945019.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6404/9318/files/dpi_elo_secure_home.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_off00005018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5018 5960 bytes
SHA-256: b583390988c79d8d4819c22177521c10d13f5215cae4cbfb062ebc27f9fb11f6
font_01_sfnt_off0000647d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x647D 11516 bytes
SHA-256: 76a049f712f4cde92d2a2f7c78a196d9f935c4ba5b6617f84b556f861230cadd

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