Malicious PDF — malware analysis report

Static analysis result for SHA-256 8732b648a561e13f…

MALICIOUS

PDF

43.1 KB Created: 2020-08-26 17:30:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9988015fc2357f01957f661558edb9bf SHA-1: 2fc7057222112f9385df4bb832214fe0035faae7 SHA-256: 8732b648a561e13f69a1d49332e09fdb3f52924d263c0318ad176156cd751333
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files, which is indicative of a link farm or SEO poisoning attempt. The primary link directs to a known malicious redirector, suggesting the document is designed 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.ru/pify?keyword=expose+sur+la+negritude+dans+balafon
    • http://files.theperfectshipping.com/uploads/1/3/1/6/131606065/mugigawemago_gajaruxavilozu_nezujetofuvuxe_kadagi.pdf
    • http://files.rozannaartist.co.uk/uploads/1/3/1/8/131856333/bopakasolew_vifaniz_vivatativuwudit_mibamusexawugal.pdf
    • http://janup.handmadeutah.com/uploads/1/3/0/8/130814328/cfe9bf45405b3.pdf
    • http://xuzoz.rimrockmanagement.biz/uploads/1/3/1/4/131437987/gogim.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5244/9435/files/gukamup.pdf
    • https://cdn.shopify.com/s/files/1/0437/6700/5333/files/ceiba_pentandra_usos.pdf
    • https://cdn.shopify.com/s/files/1/0431/8094/9658/files/34494704884.pdf
    • https://cdn.shopify.com/s/files/1/0453/2230/5691/files/nobasotugugumijijapozun.pdf
    • https://cdn.shopify.com/s/files/1/0434/8333/2773/files/wegmans_catering_menu_2020.pdf
    • https://cdn.shopify.com/s/files/1/0436/1905/7822/files/jojilafukufupugokuxasux.pdf
    • https://cdn.shopify.com/s/files/1/0434/0409/9735/files/capsule_filling_machine_principle.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_off00006588.bin
35093f8e83c6f1ba891666be0ddc7c1c67d4d381ac3e7a3d6a7d7903db3c5647
pdf-font-stream PDF embedded font (sfnt) at offset 0x6588 5376 bytes
font_01_sfnt_off000077de.bin
69baaf28ec3d8415b282a01e53aae623d2eb2a3dddcccc3c2f8722092b5d442c
pdf-font-stream PDF embedded font (sfnt) at offset 0x77DE 12128 bytes