Malicious PDF — malware analysis report

Static analysis result for SHA-256 41a240618f9b50a5…

MALICIOUS

PDF

51.3 KB Created: 2020-08-28 02:41:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e75257b127bcd8898eb3ecac3ff8004f SHA-1: 0665709b1ed670059d925798fa0052d0eecbdf53 SHA-256: 41a240618f9b50a572692149242973b6896f504bfe6139f910a366ca07c9f201
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, directing users to 'ttraff.ru'. The document body, though heavily obfuscated, contains the same URL and a physics-related question, likely a lure. The presence of numerous links to Shopify-hosted PDFs suggests a link farm or SEO poisoning attempt to improve search engine ranking for malicious content. No scripts were extracted, but the primary attack vector appears to be social engineering via a malicious link.

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=find+the+wavelength+%25CE%25BB+of+the+80.0-khz+wave+emitted+by+the+bat
    • http://files.jordandeadseaminerals.com/uploads/1/3/0/9/130969231/815595.pdf
    • http://polisida.emilybmartin.net/uploads/1/3/1/3/131380160/f5301faf.pdf
    • http://files.lunaleathers.com/uploads/1/3/2/6/132695568/99dbf6dc223.pdf
    • https://cdn.shopify.com/s/files/1/0431/0820/4704/files/84051284946.pdf
    • https://cdn.shopify.com/s/files/1/0431/1754/3588/files/sasixaj.pdf
    • https://cdn.shopify.com/s/files/1/0436/0539/3570/files/zinigajabazijujirenijo.pdf
    • https://cdn.shopify.com/s/files/1/0440/1646/8133/files/nogejatemuze.pdf
    • https://cdn.shopify.com/s/files/1/0427/9789/1751/files/rock_crock_recipes.pdf
    • https://cdn.shopify.com/s/files/1/0432/5199/0691/files/system_out_println.pdf
    • https://cdn.shopify.com/s/files/1/0435/2511/1967/files/graph_linear_inequalities_in_two_variables_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/7480/4126/files/children_s_cheerleading_uniforms.pdf
    • https://cdn.shopify.com/s/files/1/0439/1282/2939/files/78519453134.pdf
    • https://cdn.shopify.com/s/files/1/0431/3609/0267/files/97904376360.pdf
    • https://cdn.shopify.com/s/files/1/0437/8502/7745/files/space_engineers_mes_settings.pdf
    • https://cdn.shopify.com/s/files/1/0430/4030/9402/files/45143424203.pdf
    • https://cdn.shopify.com/s/files/1/0437/0196/0854/files/508804726.pdf
    • https://cdn.shopify.com/s/files/1/0435/2717/6344/files/cavitation_and_bubble_dynamics_brennen.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_off00007618.bin
828fdcf7e345f73d03c6cfcccc41c0cace8b3be3340db23ec0af64bca9c870d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7618 6016 bytes
font_01_sfnt_off00008aa9.bin
c670010c9555267b1fcb857d6f2429fe0653a965fa687cfa6b72e15fe45b01f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AA9 16144 bytes

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