Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b422d31dfa470f4…

MALICIOUS

PDF

37.2 KB Created: 2020-09-23 23:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 684141f5131b137c45a4244004688e1f SHA-1: ef50fec08034c226a8ddff447328884e40d43e88 SHA-256: 6b422d31dfa470f43c17e1aec7d5b95e40f6eb4011373837eb47aee2d6ab9fd7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded links, with one identified as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting an attempt to manipulate search results or distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful sites.

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.me/wix?keyword=virtual+lab+glencoe+e09 In PDF document text
    • http://files.alcapritto.com/uploads/1/3/1/4/131453595/d136b.pdfIn PDF document text
    • http://files.columbiaclothiers.com/uploads/1/3/1/6/131636789/lovixodokoxep.pdfIn PDF document text
    • http://lelufiti.serenitystradingpost.com/uploads/1/3/0/7/130738697/zirudawewo-telodenorarog.pdfIn PDF document text
    • http://masevuj.voterodcasey.com/uploads/1/3/1/3/131380160/1326321.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c3fe60b7-b3d2-4555-a07a-daf700b8161c.filesusr.com/ugd/9f69bd_470de183d0de47ce9def53fa5c15947e.pdf?index=trueIn PDF document text
    • https://27cb6364-5584-4156-9de6-375706b53ea0.filesusr.com/ugd/f1c748_7af627ab224a416e9be115f866619758.pdf?index=trueIn PDF document text
    • https://47162bfc-f316-48b9-add4-cc56c4a66691.filesusr.com/ugd/9421c8_6c24a88dd3014fdf88f53602f24b3706.pdf?index=trueIn PDF document text
    • https://14aac179-b4ca-432e-abdb-d049ba4c8e8f.filesusr.com/ugd/2ac701_dcc637bf83944866a99829f6c2e007cc.pdf?index=trueIn PDF document text
    • https://5b7ef4f0-1073-41e6-8964-46529efbf7f6.filesusr.com/ugd/b4609a_07ab2d411ff24c98bca251ac5aca6c96.pdf?index=trueIn PDF document text
    • https://dc3dae64-5eca-42f1-ad86-316390b510bd.filesusr.com/ugd/46a5ae_c357e12c81604ca487fa6784c66761bc.pdf?index=trueIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7886/0454/files/a_train_accelerating_uniformly.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fezusagofetivori.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2538/3074/files/wifevezolexenurinuwufuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3140/3423/files/canary_wharf_estate_map.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0832/7829/files/jifegamomufev.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_off000049e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x49E2 5192 bytes
SHA-256: 87d5c6fe25f1bf4dd32073640ddcea8d5bc05d40d459d2eeb4ae473d5d4f5382
font_01_sfnt_off00005ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BA2 13492 bytes
SHA-256: 3dfe3dfa28b57e48199e193c0b761bcd5f1a0503b07f2d7ed8c7dcfd9347d117

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