Malicious PDF — malware analysis report

Static analysis result for SHA-256 3773a5dda79cde57…

MALICIOUS

PDF

42.0 KB Created: 2020-08-26 23:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2804395e9b986f9b7a43ba6cffe5c92a SHA-1: 030369b7d2d79ac299f519343acfc3249e499adc SHA-256: 3773a5dda79cde57a917c071ae1d8f3e64786502cf7abb104cba841348d159ab
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF was flagged as malicious due to a large number of embedded links, many of which point to a redirector service. The primary malicious URL identified is https://ttraff.ru/pify?keyword=fluidos+corporales+caracteristicas. The document body contains garbled text but also includes the same malicious URL, suggesting an attempt to obscure the true destination. The presence of numerous links, including those hosted on Shopify, indicates a link farm strategy to distribute malicious content.

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=fluidos+corporales+caracteristicas
    • http://fuwil.soarohio.org/uploads/1/3/0/8/130874113/jabaxosotelibo-mavitudul-volagexijufor.pdf
    • http://rokokol.jennyrmorrispwms.org/uploads/1/3/1/3/131398440/wuriw.pdf
    • https://cdn.shopify.com/s/files/1/0430/6698/2561/files/67711780956.pdf
    • https://cdn.shopify.com/s/files/1/0432/6536/0034/files/deutsch_autosport_connectors.pdf
    • https://cdn.shopify.com/s/files/1/0432/4923/8184/files/xobofinij.pdf
    • https://cdn.shopify.com/s/files/1/0429/9807/1450/files/66306551815.pdf
    • https://cdn.shopify.com/s/files/1/0433/1703/5166/files/11422574457.pdf
    • https://cdn.shopify.com/s/files/1/0436/3301/6982/files/97336741610.pdf
    • https://cdn.shopify.com/s/files/1/0437/7883/4583/files/agricultural_extension_and_rural_development.pdf
    • https://cdn.shopify.com/s/files/1/0436/4494/4542/files/23956905278.pdf
    • https://cdn.shopify.com/s/files/1/0433/1008/8342/files/36871337093.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/binoluso.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/xokagoxenig.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063ed.bin
9e1b298e7ba64fe1fadbcc18a5744fc3cc33e73f6a213b00e2b0e8653b36ba6f
pdf-font-stream PDF embedded font (sfnt) at offset 0x63ED 5020 bytes
font_01_sfnt_off00007507.bin
300397b722255f8f6c133c1934b53237f77853feb8c7a4fed569d8fea76883ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x7507 11260 bytes