Malicious PDF — malware analysis report

Static analysis result for SHA-256 75f194a81a8f0cd1…

MALICIOUS

PDF

40.6 KB Created: 2020-08-23 01:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c697c48880c82498037a3dce127fe11b SHA-1: 304286620ee1c9cd2a198315bb24e22cceab8b51 SHA-256: 75f194a81a8f0cd12de51a4649f4796aa158210f4eb4f468550e22c4324b7bce
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which are designed to appear as legitimate educational resources but redirect to malicious infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags the URL 'https://ttraff.ru/pify?keyword=math+slope+intercept+form+worksheets' as a known malicious redirector. The 'PDF_SEO_LINK_FARM' heuristic indicates a mass of external PDF links, suggesting an attempt to manipulate search engine results or distribute malicious content.

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=math+slope+intercept+form+worksheets
    • http://xinifuwo.leadingyouhome.org/uploads/1/3/0/9/130969204/roxoxofez.pdf
    • http://files.just-jane-designs.com/uploads/1/3/2/6/132681153/a0205f35f3c0bfd.pdf
    • http://files.envisioned-events-elite.com/uploads/1/3/0/8/130814423/7523459.pdf
    • http://sesivux.kingfisher-strategy.com/uploads/1/3/2/3/132302868/9874854.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2550/6208/files/51587064597.pdf
    • https://cdn.shopify.com/s/files/1/0434/7337/1288/files/portfolio_lighting_manual.pdf
    • https://cdn.shopify.com/s/files/1/0463/6678/5691/files/czardas_violin_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/1980/4578/files/waxewevuxukadog.pdf
    • https://cdn.shopify.com/s/files/1/0430/0662/3903/files/environmental_compliance_report.pdf
    • https://cdn.shopify.com/s/files/1/0430/0688/6051/files/88478406067.pdf
    • https://cdn.shopify.com/s/files/1/0437/4944/1688/files/depejeziliru.pdf
    • https://cdn.shopify.com/s/files/1/0428/0477/3031/files/zuma_s_revenge_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/7086/4037/files/tevagepikexemasavoru.pdf
    • https://cdn.shopify.com/s/files/1/0431/8032/7070/files/66595476194.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_off00005add.bin
b84df921f4fe84c0463ed9552962384d7013adde34e275b995dbfe09f771c7e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x5ADD 5416 bytes
font_01_sfnt_off00006d35.bin
fb86ebcf7c1d28286c609eb889b59b556744821f57fa4261c2af02f65e83aaa0
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D35 12600 bytes