Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceca959ab10a211a…

MALICIOUS

PDF

39.5 KB Created: 2020-08-29 17:21:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4739233af57eeb644dcc57844e1b1d0 SHA-1: cfda254fdadbd4a71c3792dbe74a455b5150712b SHA-256: ceca959ab10a211aa94ed9f39e17deac01a7a660b35e70b16118dc0da9419263
152 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains a link farm of numerous PDF documents. One of the embedded URLs, 'https://ttraff.ru/wix?keyword=durufle+requiem+score', is identified as a known malicious redirector. The document body contains garbled text and embedded URLs, suggesting it is designed to lure users to malicious sites rather than convey legitimate information.

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.ru/wix?keyword=durufle+requiem+score
    • https://static.usrfiles.com/ugd/b8c837_5689eced90bd429ca9020d6800e11d52.pdf
    • https://static.usrfiles.com/ugd/238140_507c50a43fdf42d696b9cf17b98b8548.pdf
    • https://static.usrfiles.com/ugd/b8c837_aacdb2b4e93540f9b50dc859f16f846e.pdf
    • https://static.usrfiles.com/ugd/b8c837_b91b48a6a76541df97e01299ba7a0da1.pdf
    • https://cdn.shopify.com/s/files/1/0444/4828/4839/files/bank_po_exam_syllabus_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/7549/4300/files/shona_alphabet_with_pictures.pdf
    • https://cdn.shopify.com/s/files/1/0432/5310/4790/files/baxijefonuta.pdf
    • https://cdn.shopify.com/s/files/1/0430/9241/0525/files/10375415342.pdf
    • https://static.usrfiles.com/ugd/b8c837_da5adb8e71fd40859d7005dd63a525a9.pdf
    • https://static.usrfiles.com/ugd/b8c837_79a4e57205f04ba58e0393a2ba477be0.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005eef.bin
8dc7988c8ef06cfca1f8c162d0cab05f4e50640596c4b668ed9358326f3d2477		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EEF 4940 bytes
font_01_sfnt_off00006fab.bin
4b0c86bf8482c25941833b7be4ff2ce4dcc55872309d12fc704c78a153f98e49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FAB 10076 bytes

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