Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c738c4186b5d505…

MALICIOUS

PDF

47.8 KB Created: 2020-09-01 06:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b0e98d5ec7de68c57b712f6de5d942a SHA-1: 14462d31aaeaac8fbab607d98f82693c4dc76e7e SHA-256: 7c738c4186b5d50527cb929796b971c79bfeedc74ff4b4d4f434facf6d82a9b3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded URLs, with one identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links suggests a link farm or SEO manipulation tactic to distribute malicious content. Although no scripts were directly extracted, the PDF structure and embedded links indicate an attempt to redirect users to potentially harmful sites.

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.com/wix?keyword=sheet+music+schubert+impromptus
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/1817/4107/files/aprenda_a_desenhar_pessoas_guia_completo.pdf
    • https://cdn.shopify.com/s/files/1/0430/2913/5521/files/grade_5_math_worksheets_canada.pdf
    • https://cdn.shopify.com/s/files/1/0435/2340/8032/files/56748321614.pdf
    • https://cdn.shopify.com/s/files/1/0434/4581/3413/files/vubetominuzobosuguxuxetam.pdf
    • https://cdn.shopify.com/s/files/1/0429/3813/8783/files/cause_and_effect_worksheet_grade_7.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5476/files/41623179615.pdf
    • https://static.usrfiles.com/ugd/12f4eb_623e31a0093241a5bbf3f7bfe87b4dc1.pdf
    • https://static.usrfiles.com/ugd/b8c837_65dfe86a58bd423d897cd235e8a110fc.pdf
    • https://static.usrfiles.com/ugd/ec0c41_4cb622dd81e94dea8c0bc2e75400898a.pdf
    • https://static.usrfiles.com/ugd/b3bc21_bf1239a1056f4135b19e120ff59a207f.pdf
    • https://cdn.shopify.com/s/files/1/0428/4638/8380/files/bbc1_scotland_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/2158/9913/files/86837172921.pdf
    • https://cdn.shopify.com/s/files/1/0436/9724/2262/files/cervical_neck_strain_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0435/3287/7976/files/adobe_character_animator_cc_full.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000588f.bin
ed4e56a6936b9d69c853986fbdd43c14169d00e4e829e0c67b8c0338070f964f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x588F 5172 bytes
font_01_sfnt_off000069fa.bin
ded588bae245ab0fa7fa086b4a5f377169638ad31d4d5b543b34b947dbf778a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69FA 16036 bytes
font_02_sfnt_off00009b29.bin
fb7b45e24c28c4473d0ca1c6410c593992d9a809009f9c41b5ae32c9142507dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B29 16120 bytes

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