Malicious PDF — malware analysis report

Static analysis result for SHA-256 751879e028ecfc82…

MALICIOUS

PDF

38.9 KB Created: 2020-09-13 06:39:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25efe5e4c4e3d74df5b1ab9d92034f7b SHA-1: 60eaae6889effe1ea0e427df16e697a5edb34fe9 SHA-256: 751879e028ecfc8200ecc29d2f21a564547a5acc60049dd9a8cb27fcb8ffa5aa
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to external PDF files hosted on Shopify and other domains, suggesting a link farm or SEO manipulation tactic. One prominent URL, https://ttraff.link/wix?keyword=go+math+grade+5+teacher+edition, is identified as a malicious redirector, indicating an attempt to lead users to harmful content. The ML classifier also strongly flagged this PDF as malicious.

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.link/wix?keyword=go+math+grade+5+teacher+edition
    • http://rowak.ldk-art.com/uploads/1/3/1/3/131398140/rilanup.pdf
    • http://fajarula.sossanantonio.org/uploads/1/3/1/3/131398591/xemewevimizunuposo.pdf
    • http://files.wilsonfeed.com/uploads/1/3/2/6/132695575/bilam.pdf
    • http://lisajexu.0frenchpolishing.com/uploads/1/3/1/1/131164173/86e9b5914dbd2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3323/9457/files/employment_news_14_september_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/9114/0510/files/16682509155.pdf
    • https://cdn.shopify.com/s/files/1/0440/8596/9048/files/63010247676.pdf
    • https://cdn.shopify.com/s/files/1/0430/6213/2897/files/57353587459.pdf
    • https://cdn.shopify.com/s/files/1/0427/6961/2966/files/xigajupuzuduvisivoxi.pdf
    • https://cdn.shopify.com/s/files/1/0440/5926/3128/files/how_to_download_off_lovers_lab_for_sims_4.pdf
    • https://cdn.shopify.com/s/files/1/0430/3103/6053/files/electricity_generating_authority_of_thailand_annual_report.pdf
    • https://cdn.shopify.com/s/files/1/0428/4071/9516/files/gosukovosebobakuxapejuwa.pdf
    • https://cdn.shopify.com/s/files/1/0429/7188/9815/files/mazewatifurixovexe.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7734/files/23583362425.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_off000058d3.bin
c81b97c918d565c61037e2adadd6a0c84c8149283b4004e265f87ea3deeccc7f
pdf-font-stream PDF embedded font (sfnt) at offset 0x58D3 5300 bytes
font_01_sfnt_off00006aaf.bin
704cb4b02af5537c11fc27bfc560bd1bfcde2eea77efaf8ac0c52876cf8cb99e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AAF 10444 bytes