Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8eca3964399dbe7…

MALICIOUS

PDF

60.6 KB Created: 2020-08-31 21:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6ca30dc360f09e01e8cf4ede38f8d99 SHA-1: 4da57ec1175abf402e5c8ea49b483500578176f7 SHA-256: a8eca3964399dbe7fc313c1ab1746eee8bb71226f3708b2bd9285483fb164723
154 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector at 'https://ttraff.ru/wix?keyword=animated+gif+icons'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, appears to contain the same malicious URL and other benign-looking URLs, suggesting a lure to external 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://ttraff.ru/wix?keyword=animated+gif+icons
    • https://static.usrfiles.com/ugd/44b221_18078781be2749e79176b1d577400108.pdf
    • https://static.usrfiles.com/ugd/b8c837_d7e4032911c447a1b1c289acb84cc05b.pdf
    • https://static.usrfiles.com/ugd/834936_fe8a8ea6127c4b63a711e921bf55292a.pdf
    • https://static.usrfiles.com/ugd/77eba6_25fa356120474ac181ea92c077a054f9.pdf
    • https://static.usrfiles.com/ugd/5ad03d_2ca8b127e2f94d30afe4deb3281790a1.pdf
    • https://cdn.shopify.com/s/files/1/0436/9186/8310/files/dining_room_and_banquet_management_4.pdf
    • https://cdn.shopify.com/s/files/1/0430/6268/9946/files/33461460676.pdf
    • https://static.usrfiles.com/ugd/b8c837_7de288fed27540c89c218e76bc81b2e8.pdf
    • https://static.usrfiles.com/ugd/b8c837_218497b50b594ead968c1459b005b99b.pdf
    • https://static.usrfiles.com/ugd/b8c837_665cf2c14ae843bfb5d9ccd3087f63af.pdf
    • https://cdn.shopify.com/s/files/1/0445/3564/4319/files/absceso_pulmonar_separ.pdf
    • https://cdn.shopify.com/s/files/1/0434/8660/9573/files/laporan_pendahuluan_aneurisma_aorta_abdominalis.pdf
    • https://cdn.shopify.com/s/files/1/0430/9699/8041/files/consulta_antecedentes_procuraduria.pdf
    • https://cdn.shopify.com/s/files/1/0437/2037/6474/files/96356720056.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007fdd.bin
a3cd0cd412ea290f7154ce7799df06fa2f851ed78c1dfde99a7eb6b7e7c02551		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FDD 5200 bytes
font_01_sfnt_off00009180.bin
44c62d7752e5152ca177ac481ff877e0589b88ac7c1662593a1846213ca2b6a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9180 7760 bytes
font_02_sfnt_off0000a7c9.bin
6e2fe50ecbcb5fc69e11b530f206c4e5687efb788bab473059692444cb9e91dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7C9 12448 bytes
font_03_sfnt_off0000cfe2.bin
560e11d5da3ed60647d844d0127c34f4fbbc0b68999cbe35161ddcd790341c9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE2 16208 bytes

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