Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0d94d249bf831ea…

MALICIOUS

PDF

40.7 KB Created: 2020-10-15 11:45:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3d2b399bf13f64234f1de00420d3eedf SHA-1: fc9339f27ab266d46091d772e445b559f3c13721 SHA-256: c0d94d249bf831eab3b3dd6b0d9ad555d0d5682bff16e464e5bbc82382da2107
154 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL https://gettraff.ru/123?keyword=test+riesgo+cardiovascular+pdf, which is identified as a malicious redirector. The presence of numerous other PDF links, many hosted on strikinglycdn.com, suggests a link farm or SEO manipulation tactic to distribute 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://gettraff.ru/123?keyword=test+riesgo+cardiovascular+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366982/normal_5f875924c79ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367287/normal_5f874c9512b0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369185/normal_5f879d87b8f42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365555/normal_5f8740d3278b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369499/normal_5f87c9a8859a8.pdfIn PDF document text
    • https://suzokixuvajix.weebly.com/uploads/1/3/0/7/130776208/5613269.pdfIn PDF document text
    • https://xebikazogede.weebly.com/uploads/1/3/2/7/132740990/80e56d498663.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/6c9ff081-7e79-46a6-aeb7-1d2776d25f68/93877177475.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe733b8a-70c5-4bb4-9e88-3004aba237c2/topijetubawotasa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c229f13-246a-4831-94e1-681a6ddf8d80/31160489713.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13936074-d8e6-44f9-80d6-6bd0ca2a1270/45918026615.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfdf2b05-09bf-4cbb-9d6c-b8303dbec6fc/89669570102.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/806fc0aa-9810-48c1-846d-aceffac92ac5/nowiranomilusanorixadif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3607e51-a603-4e88-a1ff-0033bcaf8443/gotufetapob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c58d20d-5514-4283-8161-bd4c2b952883/80920437296.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8526/7097/files/piwivekaliviwusowom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/0690/6535/files/rusapodagefa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0378/8959/files/digapid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5012/9813/files/renew_my_smile_mn.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000054bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x54BB 5108 bytes
SHA-256: d8e5b2151fed3cfef3f63abf59a525eda9d258b60c57acc134c7cf74bf30711c
font_01_sfnt_off0000663b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x663B 9720 bytes
SHA-256: 1ad59d61c59596fb77ec371dd75d07cfedd1962e63a30971cdf375c9012580a7
font_02_sfnt_off00008778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8778 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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