Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f6cbd92b708d68…

MALICIOUS

PDF

33.3 KB Created: 2020-11-03 01:51:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57bfa0bb5ae2c25d52802b94e19a8351 SHA-1: bf596badf30e8991d0ee62821809d0e4ae231984 SHA-256: 20f6cbd92b708d685c258a7aeeaf87f934c0714667a526b7fbe1c367963bd414
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying it as a link farm designed to redirect users to malicious infrastructure. The primary malicious URL identified is https://ttraff.me/123?keyword=words+that+start+with+shew. While no scripts were extracted, the PDF structure and embedded links strongly suggest a phishing or redirection attempt, likely delivered as a spearphishing attachment.

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.me/123?keyword=words+that+start+with+shew
    • https://cdn-cms.f-static.net/uploads/4387230/normal_5f998fa7f2fc1.pdf
    • https://cdn-cms.f-static.net/uploads/4410204/normal_5f9d19e5e91fb.pdf
    • https://cdn-cms.f-static.net/uploads/4405644/normal_5f9ae02bf2bea.pdf
    • https://cdn-cms.f-static.net/uploads/4421783/normal_5f9a9f54a3d4f.pdf
    • https://cdn-cms.f-static.net/uploads/4373987/normal_5f9018a46f711.pdf
    • https://cdn-cms.f-static.net/uploads/4366668/normal_5f87663c9f661.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/miwolezedubujoz/6602225232.pdf
    • https://cdn.shopify.com/s/files/1/0500/0436/1366/files/goruvakajuvom.pdf
    • https://cdn.shopify.com/s/files/1/0497/5824/0922/files/types_of_geodatabase.pdf
    • https://cdn.shopify.com/s/files/1/0500/7772/8963/files/3183904952.pdf
    • https://cdn.shopify.com/s/files/1/0504/2887/0832/files/what_is_l_for_lees_real_name.pdf
    • https://cdn.shopify.com/s/files/1/0502/2243/2428/files/wii_u_power_cord_for_gamepad.pdf
    • https://cdn.shopify.com/s/files/1/0498/7093/0075/files/prepatellar_bursitis_nhs.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_off000045b6.bin
52d8be8d97fa393473575d3c574415863b0f8d47d4a979302428cf3956640b3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x45B6 4988 bytes
font_01_sfnt_off000056b7.bin
aa9a53ea4197313e70b05ca5b65b7385a908bf686393be25d6442f5049856dcb
pdf-font-stream PDF embedded font (sfnt) at offset 0x56B7 9968 bytes