Malicious PDF — malware analysis report

Static analysis result for SHA-256 4827a71b9ce30c8f…

MALICIOUS

PDF

40.6 KB Created: 2020-10-31 18:46:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3f23903bd7bd861e903b54448787f769 SHA-1: 10133845092332d044c9f49032d42efa324f97c5 SHA-256: 4827a71b9ce30c8fd4ea4ff14600a2c9acfddeb285674a0139b3df0a47871198
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. Another critical heuristic identified a 'PDF link farm' with many external PDF links, suggesting a deceptive SEO or content distribution scheme. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is designed to redirect 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://cctraff.ru/pify?keyword=ukf8001+water+filter In PDF document text
    • https://gezeteweni.weebly.com/uploads/1/3/4/0/134040803/xezutotikaxudes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392452/normal_5f9ad5b744bc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371013/normal_5f88b7461b920.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387061/normal_5f935ba155967.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386091/normal_5f923a7b813ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366623/normal_5f877fd08c057.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417222/normal_5f9548518d276.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393632/normal_5f9a8bb7e96d4.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/1/0476/6528/3238/files/difficult_words_and_their_meanings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78321f2a-c61e-460b-8eed-ecf1b5543e98/luton.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8547/7541/files/hamilton_beach_ice_cream_maker_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15c7fbbd-1f35-4945-9124-cff2e55bb7e9/37875592197.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99a36c3d-907f-4fc9-bc76-51acdffb2576/lijegazukugubedejusaxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61dd5288-9cc9-4b66-82fc-c6a1137f60c8/laviju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c7410f5-caf8-41a1-8603-7d2d4da38e7c/rujutedetuwato.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_off000062dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62DC 5116 bytes
SHA-256: a6eabba03be50c4b17936f4a402963666805401e553205660690fcb1fe9c0ce6
font_01_sfnt_off00007476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7476 9712 bytes
SHA-256: 873cddcf51c0945700a7999079e84669ffad3b27dc86250d95193741a2bf2f17

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