Malicious PDF — malware analysis report

Static analysis result for SHA-256 950c1cb39e61ed56…

MALICIOUS

PDF

34.4 KB Created: 2020-08-19 21:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4304b162d32a6f80ae40191bb5a3594 SHA-1: 4c15bb57c37913960171a9a8cced56c641fa2e1a SHA-256: 950c1cb39e61ed561bfeb5f9838737d843db226276567b1aae62dd68915ea47b
152 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a NOAA aviation weather report, which is a common lure for phishing. The document body and embedded URLs confirm the presence of multiple links, many pointing to Shopify domains hosting PDF files, suggesting a link farm used for SEO poisoning or to obscure the final malicious destination. The ML classifier strongly indicated maliciousness.

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=noaa+aviation+weather+report
    • http://zidiz.vintagenllwings.com/uploads/1/3/1/4/131453945/wogeloriki.pdf
    • http://sazozo.geirthewriter.com/uploads/1/3/1/3/131398020/7859487.pdf
    • http://files.utopiafilmfestival.org/uploads/1/3/1/8/131856498/felofekebibozewofol.pdf
    • http://jezokewa.ukyorthoresidency.com/uploads/1/3/1/3/131378816/39c6ce339e.pdf
    • http://wibedopu.nycsigmakappa.com/uploads/1/3/0/7/130776177/7773020.pdf
    • https://cdn.shopify.com/s/files/1/0433/3505/7559/files/babof.pdf
    • https://cdn.shopify.com/s/files/1/0434/1334/0312/files/kubutux.pdf
    • https://cdn.shopify.com/s/files/1/0430/1760/1181/files/50704692949.pdf
    • https://cdn.shopify.com/s/files/1/0440/3894/6981/files/6956611475.pdf
    • https://cdn.shopify.com/s/files/1/0432/6588/4323/files/marksheets_of_ias_toppers_2017.pdf
    • https://cdn.shopify.com/s/files/1/0438/4188/0224/files/asma_bronquial_signos_y_sintomas.pdf
    • https://cdn.shopify.com/s/files/1/0441/4413/2248/files/55311999317.pdf
    • https://cdn.shopify.com/s/files/1/0429/5832/3865/files/mufero.pdf
    • https://cdn.shopify.com/s/files/1/0434/1137/4230/files/gopubanubugepinuvapem.pdf
    • https://cdn.shopify.com/s/files/1/0439/9477/5710/files/kubemowugemukazepigeviga.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b54.bin
626982e9aa3cc53f8ce80c9c55a91d414a5b96d5e1ddd4bb6b2b6d6dcc52703b
pdf-font-stream PDF embedded font (sfnt) at offset 0x4B54 4820 bytes
font_01_sfnt_off00005bc9.bin
61f514364a3d997270ddf967cfe8ad2c4dbdfa13174752b159a7a737885a2d23
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BC9 9704 bytes