Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a03cdadd67ebf31…

MALICIOUS

PDF

42.7 KB Created: 2020-09-17 09:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8d906420c679bd98845f0790733324b SHA-1: d0610a6c541bc32cc7ce6dd08b8c044e2e6b2038 SHA-256: 6a03cdadd67ebf3187b74970a1d4e2dda67c7f3b588f381e022d745c6f72b090
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the redirector link. The presence of numerous external PDF links, many pointing to benign content, suggests a link farm designed to obscure the malicious redirector.

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.me/wix?keyword=seize+the+day+guitar+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://74e63c59-64c7-4af0-a2eb-c60c6e5d3935.filesusr.com/ugd/8db125_069d68a3108345aaa7134356b9557220.pdf?index=true
    • https://14d9fb74-4342-43e4-b3eb-4e6ba9e7b6c3.filesusr.com/ugd/370ea2_f5ed0f1d437a4f199868669a97f13494.pdf?index=true
    • https://8991bc2c-ef1a-4e7f-851c-f9fb09a53e91.filesusr.com/ugd/d99ef3_a262556da34d4ee4875835914227a335.pdf?index=true
    • https://fb0283d6-50be-48cc-b989-59d05e36dd6a.filesusr.com/ugd/78daac_313ff3c235554bd1a30ce30b1c15e4e7.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0439/3644/8667/files/passport_index_2019.pdf
    • https://cdn.shopify.com/s/files/1/0429/7395/4204/files/85371974974.pdf
    • https://cdn.shopify.com/s/files/1/0439/3464/6440/files/rejalujuru.pdf
    • https://cdn.shopify.com/s/files/1/0435/3989/0327/files/dragon_ball_z_kai_crunchyroll.pdf
    • https://cdn.shopify.com/s/files/1/0433/4023/4917/files/carte_du_monde__imprimer_format_a4.pdf
    • https://cdn.shopify.com/s/files/1/0429/2666/9987/files/67788369581.pdf
    • https://cdn.shopify.com/s/files/1/0428/0143/0695/files/31415691245.pdf
    • https://cdn.shopify.com/s/files/1/0432/3396/8287/files/microsoft_word_emergency_contact_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/2514/5760/files/68464699058.pdf
    • https://cdn.shopify.com/s/files/1/0434/1032/5671/files/diva_cup_user_guide_section_b.pdf
    • https://cdn.shopify.com/s/files/1/0437/2480/0151/files/quadratic_regression_equation.pdf
    • https://cdn.shopify.com/s/files/1/0434/8398/8125/files/convert_set_to_list_python.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061b5.bin
bae1bf29ee461a82d9219373d7a4f77c665a96ea7c510cba104a57daed3d13ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61B5 5348 bytes
font_01_sfnt_off000073f2.bin
b24ff8ebba4ebc971a3953e8ac80066c7d0d36577c7b4ef05e0230c13dc82dd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73F2 13280 bytes

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