Malicious PDF — malware analysis report

Static analysis result for SHA-256 7490130052bf6918…

MALICIOUS

PDF

43.4 KB Created: 2020-10-04 10:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 04e424b3f3730a67f895c47433ed0814 SHA-1: acb657e2251bcd01e1c0212675ac548390ae9972 SHA-256: 7490130052bf6918e869ce45148a324499a833501f00d2865d4969a077bd9a56
154 Risk Score

Malware Insights

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

The PDF contains a link farm heuristic, indicating it hosts numerous external links. One of these links, https://cctraff.ru/strik?keyword=libro+contabilidad+basica, is identified as a malicious redirector. The document body, though heavily obfuscated, contains this URL, suggesting an attempt to direct users to malicious infrastructure. The presence of embedded URLs and the ML classifier's high confidence further support this assessment.

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://cctraff.ru/strik?keyword=libro+contabilidad+basica In PDF document text
    • http://files.savemetislighthouse.org/uploads/1/3/1/3/131380126/rimofumavorojidisol.pdfIn PDF document text
    • http://files.newlifebaptisthp.com/uploads/1/3/1/6/131636890/4628793.pdfIn PDF document text
    • http://difoz.mrsmoothbeatz.com/uploads/1/3/1/6/131637309/7b34fd57c.pdfIn PDF document text
    • http://files.authorangelawhite.website/uploads/1/3/2/7/132741556/2b41b.pdfIn PDF document text
    • http://lixebud.wagassociates.com/uploads/1/3/2/6/132696280/589e726412c8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3937/5012/files/moto_x3m_3_unblocked_76.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/3079/7224/files/weeki_wachee_preserve_kayaking.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3368/8226/files/dialectical_journal_template_microsoft_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73984974-133d-4e45-915e-9abd80201e29/66421626602.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/6855/0037/files/zepawejul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/9141/4171/files/84912496301.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7414/1864/files/49285695790.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1664/0923/files/conquista_y_colonizacion_de_america_caracteristicas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/8300/1756/files/san_francisco_music_box_company.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69B8 5012 bytes
SHA-256: 9eb9df1f2d1f99142dcb104486e010a42d085ac80f9f65c78a09e12f1b4b25ae
font_01_sfnt_off00007acf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7ACF 11276 bytes
SHA-256: 4810b84db02823abdec26dea195179d42935efa5c7e8ed8c4ba6880bb3d378ac

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