Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef49dad4a7221f92…

MALICIOUS

PDF

49.2 KB Created: 2020-08-28 03:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e03f315ebe26b37493d18f559409121 SHA-1: a810a5c676ea1492acc9aae519ecd1a2155501ca SHA-256: ef49dad4a7221f92834205dfeeac8a6eb48f74e9cee2d67eff922b5a557d47f3
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains text related to a movie title and the malicious URL. This suggests a lure to redirect users to potentially malicious content. The presence of numerous Shopify-hosted PDF links, while mostly benign, contributes to a link farm pattern. The ML classifier strongly indicates maliciousness.

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/pify?keyword=peter+pan+la+gran+aventura+pelicula+completa+en+espa%25C3%25B1ol+latino
    • http://gufil.iguanamercenary.com/uploads/1/3/1/3/131383483/f821ecaa5faa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9468/8412/files/concession_clauses_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0432/5641/4363/files/35482533804.pdf
    • https://cdn.shopify.com/s/files/1/0437/0094/5048/files/prime_factorization_worksheet_sixth_grade.pdf
    • https://cdn.shopify.com/s/files/1/0437/6874/2040/files/36514143009.pdf
    • https://cdn.shopify.com/s/files/1/0439/2707/7032/files/nuwegimimifugexa.pdf
    • https://cdn.shopify.com/s/files/1/0432/7912/2587/files/gevazogefoxun.pdf
    • https://cdn.shopify.com/s/files/1/0427/6345/2583/files/91633161430.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/gijoru.pdf
    • https://cdn.shopify.com/s/files/1/0432/6657/2452/files/13723840583.pdf
    • https://cdn.shopify.com/s/files/1/0429/9299/2410/files/gafivejovizabija.pdf
    • https://cdn.shopify.com/s/files/1/0445/1398/4671/files/cbest_writing_practice_test.pdf
    • https://cdn.shopify.com/s/files/1/0431/5476/8021/files/free_guitar_sheet_music_websites.pdf
    • https://cdn.shopify.com/s/files/1/0438/4777/8469/files/kisikivopelusa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000070a8.bin
1032829fd1e68f2db21113fa21e57ac8c0c37e370e224d102f23378ea8d86fec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70A8 5408 bytes
font_01_sfnt_off000082b5.bin
537568f14c59fc86835e2d58e6ec9ffdc1ec69d764089aa0380bd1cc8362b5d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82B5 11084 bytes
font_02_sfnt_off0000a6ae.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6AE 4324 bytes

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