Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4ed2e98e026a75d…

MALICIOUS

PDF

45.5 KB Created: 2020-09-25 16:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c17ca32ddeb5b9e8918d946ff3836e0a SHA-1: b38d0da81999326bba9588f2ca9d50863374d51a SHA-256: f4ed2e98e026a75d6e4b35a43535c4d684a58c62f3687e0f12618585683080f5
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to suspicious domains and are flagged as part of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains URLs that are consistent with this link farm behavior. The primary goal appears to be directing users to malicious or SEO-manipulated 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.link/pify?keyword=urban+farm+designs In PDF document text
    • http://fikul.autmowatl.com/uploads/1/3/2/6/132681229/8465c0c.pdfIn PDF document text
    • http://files.mgroverdesign.com/uploads/1/3/0/7/130776075/fizusig.pdfIn PDF document text
    • http://files.2cvtv.co.uk/uploads/1/3/0/8/130813516/gituma.pdfIn PDF document text
    • http://rifazadat.valdezfoundation.org/uploads/1/3/1/8/131856149/wutigulitedipeso.pdfIn PDF document text
    • http://files.connierhae.com/uploads/1/3/0/7/130775828/c79e9444c7.pdfIn PDF document text
    • http://kalazo.desertpointkennels.com/uploads/1/3/2/7/132710770/josogunetufapiwixuze.pdfIn PDF document text
    • http://potikub.metranengineering.com/uploads/1/3/1/4/131406202/reviroli-zititomokej-kusezefewiru-pikazuvova.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/1/0433/1274/2550/files/15014942325.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9885/7891/files/how_to_install_sevtech_ages.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6368/0932/files/xukelub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8806/8254/files/xepomenaloveluwizin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1119/3507/files/33151161019.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6995/4456/files/84628152201.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2518/7491/files/inside_reading_4_answers.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_off000073c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73C4 5328 bytes
SHA-256: 87d54ca4f198b3740c2401fea873e7a381311d9c8d4ab24577e96159ea8a2775
font_01_sfnt_off000085c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85C8 10504 bytes
SHA-256: ddcd1a5e410830ead5f1d57b786ce40344bd3a94cc13cf09aa4e55ff27096a7e

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