Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b2468fc87b6abfe…

MALICIOUS

PDF

37.8 KB Created: 2020-07-20 21:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f2ff8dccd40978e883af312fa17ec26 SHA-1: 2a823a78ad9990a5bc653f009bbf85194a38687f SHA-256: 9b2468fc87b6abfe104b950e72078bef86ddac9a99d53589cac0bf3170c12d69
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of embedded links, with many pointing to external PDF files hosted on various domains, including a large number on cdn.shopify.com. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body is heavily obfuscated and appears to be mostly garbage data, making it difficult to ascertain a specific lure.

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.cc/wb?keyword=conditionals%20type%201%20worksheet
    • http://files.naturaphysicaltherapy.org/uploads/1/3/1/0/131070722/9179889.pdf
    • http://files.cocoonparentingsupport.com/uploads/1/3/1/4/131407802/4624087.pdf
    • http://files.platondirector.com/uploads/1/3/0/8/130814601/5530c3.pdf
    • http://files.acorridor.com.au/uploads/1/3/0/7/130739601/4048420.pdf
    • http://files.atlanticbooking.com/uploads/1/3/0/9/130969354/jerusazupemanip.pdf
    • http://files.naturaphysicaltherapy.org
    • https://cdn.shopify.com/s/files/1/0430/0252/7895/files/kusezoxud.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/80804151078.pdf
    • https://cdn.shopify.com/s/files/1/0432/5454/6590/files/57713154018.pdf
    • https://cdn.shopify.com/s/files/1/0431/3346/8839/files/43688229468.pdf
    • https://kukodojepi.files.wordpress.com/2020/06/vorovegasokuwilidafokizo.pdf
    • https://kosezupawi.files.wordpress.com/2020/06/13956543379.pdf
    • https://dufepenal.files.wordpress.com/2020/06/96099228932.pdf
    • https://cdn.shopify.com/s/files/1/0431/8117/9048/files/21790078345.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/9467339244.pdf
    • https://cdn.shopify.com/s/files/1/0432/4671/5040/files/13337417077.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71062637782.pdf
    • https://cdn.shopify.com/s/files/1/0427/7246/3772/files/gatutugutigetolodug.pdf
    • https://cdn.shopify.com/s/files/1/0433/2349/0457/files/47504735481.pdf
    • https://cdn.shopify.com/s/files/1/0431/4087/4408/files/ropajibivolofupobebedot.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/12509012650.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_off0000588e.bin
95aeedf2968ad05b6b1b432b243b89e20e1191fbafec80dda26fb2e600a733b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x588E 5168 bytes
font_01_sfnt_off00006a36.bin
390b1bb72e8073b755801350f145d459963530f6349573bc07e8cde62adf8e4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A36 9272 bytes

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