Malicious PDF — malware analysis report

Static analysis result for SHA-256 086442298ccd5768…

MALICIOUS

PDF

45.3 KB Created: 2020-08-22 03:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f74e6c972db00aed1eb12f3de60e09d SHA-1: 439e41d53b73bfebd3b49cbad0fd4db7c23bd54a SHA-256: 086442298ccd5768faa2d7a06b4af484eb4a0d666855d5a4573c5a8a0131fde3
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as a radiology PDF. This suggests a phishing or malware distribution attempt. The PDF also hosts a large number of external links, many pointing to Shopify, which is characteristic of SEO link farm abuse. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence indicate a high likelihood of malicious intent.

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=abdominal+trauma+radiology+pdf
    • http://files.sweet-williams.com/uploads/1/3/1/4/131409677/fipew.pdf
    • http://files.towtruckmilltownnj.com/uploads/1/3/0/7/130776343/5f6347d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0854/0315/files/10497028469.pdf
    • https://cdn.shopify.com/s/files/1/0433/8951/7978/files/61225613969.pdf
    • https://cdn.shopify.com/s/files/1/0431/9641/6161/files/king_of_weighted_calisthenics_program.pdf
    • https://cdn.shopify.com/s/files/1/0430/2562/9335/files/mail_server_configuration_in_linux_step_by_step_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0437/4760/6679/files/angry_face_texting.pdf
    • https://cdn.shopify.com/s/files/1/0436/4081/5774/files/99413985192.pdf
    • https://cdn.shopify.com/s/files/1/0440/3222/9541/files/certificacion_leed.pdf
    • https://cdn.shopify.com/s/files/1/0432/9242/6405/files/20203120302.pdf
    • https://cdn.shopify.com/s/files/1/0430/3480/4375/files/41156762352.pdf
    • https://cdn.shopify.com/s/files/1/0433/3830/1590/files/xefiviworetanaresepago.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_off0000740b.bin
ba58477ad1656fa7067e19287dba77bc208b8c457f40f2e4e7cdd91e9f49d3a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x740B 5416 bytes
font_01_sfnt_off00008662.bin
bf96ca392cb1782646a80948f88738c218c9a1a31f5e2108532d0d1ae41b8b65
pdf-font-stream PDF embedded font (sfnt) at offset 0x8662 10040 bytes