Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d3ce9a5376f785f…

MALICIOUS

PDF

46.1 KB Created: 2020-08-03 13:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fdb1520ae594626f043c5508baae3716 SHA-1: 26a6f3a4a51668ce9f6d1e157f32a0a010d4b17e SHA-256: 6d3ce9a5376f785fc92ee07a2a81ef0568694edbf7fc8a77724dcb5ead200223
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to 'ttraff.ru'. The document body, though obfuscated, contains the same URL, suggesting an attempt to direct users to malicious infrastructure. The ML classifier also 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/wb?keyword=comment%20envouter%20un%20homme%20avec%20sa%20photo%20pdf
    • http://files.sandyrosswellservicing.com/uploads/1/3/1/4/131411762/zakobumima.pdf
    • http://files.jawsmechanical.com/uploads/1/3/2/7/132712282/9257191.pdf
    • http://sokimu.nfpplanning.com/uploads/1/3/0/7/130776728/8570ac9ab3f2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4313/5393/files/new_zealand_zip_code.pdf
    • https://cdn.shopify.com/s/files/1/0432/1378/3199/files/58276649360.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7046/files/zikusobedoruseje.pdf
    • https://cdn.shopify.com/s/files/1/0429/3427/2163/files/30087180582.pdf
    • https://cdn.shopify.com/s/files/1/0437/7405/0458/files/gugalidefugekasevosabaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/6676/1120/files/52453900819.pdf
    • https://cdn.shopify.com/s/files/1/0432/5244/9444/files/5568663240.pdf
    • https://cdn.shopify.com/s/files/1/0434/9899/5877/files/61540920859.pdf
    • https://cdn.shopify.com/s/files/1/0432/7066/8453/files/pegema.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_off0000731b.bin
a78a43c79655354dcc172aaf64744bb38658d823bc64359ad3fd836faeb9f0a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x731B 5328 bytes
font_01_sfnt_off00008512.bin
46f18ba7552cd822fb848318c57cea5e56bfffa51be91a3832ba6e5fe318f68b
pdf-font-stream PDF embedded font (sfnt) at offset 0x8512 11756 bytes