Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aebcdd6194d5e81…

MALICIOUS

PDF

42.5 KB Created: 2020-10-17 02:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5bd80586afc26644579988e990d51265 SHA-1: 636aec64335f2b6012a69cd79a3b2eb42fa3b20f SHA-256: 8aebcdd6194d5e813cbfea1f84af8439898f4c2810aff52c284eec5a012aa1d9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector and a link farm. The document body, though heavily obfuscated, contains URLs that are also present in the heuristics, indicating a deliberate attempt to direct users to potentially harmful sites. The ML classifier also strongly flagged this PDF as malicious.

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://ggtraff.ru/123?keyword=combining+pdfs+on+windows In PDF document text
    • https://wojeribexojuxu.weebly.com/uploads/1/3/1/8/131856158/bagurigovig_nufewufapupimu.pdfIn PDF document text
    • https://wadezadoli.weebly.com/uploads/1/3/0/9/130970015/fameralarawe.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/xewuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368772/normal_5f87816194d25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368745/normal_5f8a2294ce161.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369663/normal_5f8a1b5578fd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367656/normal_5f87bcb8f053b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366952/normal_5f8732379bbf6.pdfIn PDF document text
    • https://nipufijupetobug.weebly.com/uploads/1/3/1/4/131482996/tibevepega.pdfIn PDF document text
    • https://lajojixuvoporor.weebly.com/uploads/1/3/0/7/130738555/rorid-wapukado-garapasavujadak-kirebone.pdfIn PDF document text
    • https://pedegafulip.weebly.com/uploads/1/3/0/9/130969407/1cfb878a31bce.pdfIn PDF document text
    • https://nobinetezo.weebly.com/uploads/1/3/0/9/130969761/2b54858.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/1/0483/6121/0007/files/foxboro_high_school_graduation_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/2500/5206/files/66641321593.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/0853/8796/files/7509816800.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4256/1433/files/lixudozinawuwivupapoxedo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/1070/6619/files/gobesiludebolipawemaruwi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/1601/3982/files/65526291681.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6157/5834/files/64139187842.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8197/4435/files/lorinexumer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/0457/8973/files/unifi_ap-ac-mesh-pro_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61acfa49-fe8c-4db5-8526-1df18038e6c4/25448536033.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e9c0e8a-c322-4e12-a06d-573d27d30979/titenaz.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_off0000681f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x681F 5160 bytes
SHA-256: 47c2fab6976db37ee5caf273c94af82788c4036cb45c4e371b1886d9aa0cda43
font_01_sfnt_off000079af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79AF 10304 bytes
SHA-256: fa79b0e68dc475045eb3694c11b5dc2a72661de000660dc52fb304cb523bce8c

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