Malicious PDF — malware analysis report

Static analysis result for SHA-256 c55b10911fd34eca…

MALICIOUS

PDF

47.4 KB Created: 2020-08-16 22:17:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cca30fd7c5236314fc0ab42d936c27db SHA-1: 6027981e42af0c0598ef8e669329580f25805d98 SHA-256: c55b10911fd34eca181ca21999bc161e37dff4372b9f94432f9de2e7a9f6c67c
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is designed to lure users to malicious content. The document body, though heavily obfuscated, contains this URL and other URLs pointing to Shopify, likely as part of a link farm to improve SEO for the malicious redirector. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector attack pattern.

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=density+physical+science+if8767+answers
    • http://files.jordsen.com/uploads/1/3/1/3/131381772/vazawalopanezil_riguripupoxa_minukug_kawefupen.pdf
    • http://sobugi.feistyandalivemommy.com/uploads/1/3/1/4/131406717/cada69e7d2194.pdf
    • http://files.yukondaffodils.com/uploads/1/3/0/7/130739892/jajizixesolagavopan.pdf
    • http://files.potomacprojectservices.com/uploads/1/3/0/7/130776182/1455d96b0aa371.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/1829653553.pdf
    • https://cdn.shopify.com/s/files/1/0430/7140/6234/files/ridumimurawofiz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nisexabidubukov.pdf
    • https://cdn.shopify.com/s/files/1/0440/1407/6069/files/22193275721.pdf
    • https://cdn.shopify.com/s/files/1/0428/8974/0441/files/tixamukezirideneso.pdf
    • https://cdn.shopify.com/s/files/1/0432/5851/1510/files/67537679438.pdf
    • https://cdn.shopify.com/s/files/1/0453/5566/3515/files/mass_spectrometry_principles_and_applications_hoffmann.pdf
    • https://cdn.shopify.com/s/files/1/0432/7063/5680/files/gipaboruzefaperer.pdf
    • https://cdn.shopify.com/s/files/1/0433/3695/8104/files/vetilaloviwekalibiriv.pdf
    • https://cdn.shopify.com/s/files/1/0433/6821/8780/files/esl_library_grammar_practice_worksheets_present_perfect.pdf
    • https://cdn.shopify.com/s/files/1/0433/8696/2076/files/58683331441.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_off000068c7.bin
0e35cebb5261f7b65b7c4a4dc2e85f1ce8439bfc2ec929701925e16bfabd728e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68C7 5404 bytes
font_01_sfnt_off00007b36.bin
ca25a284e35fa08bb70cf245b5d29ae9b26d327fa3fa41b0949f9b0ed4dcbd31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B36 11164 bytes
font_02_sfnt_off0000a0d3.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0D3 4324 bytes

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