Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddaf7b92222ddf4a…

MALICIOUS

PDF

48.5 KB Created: 2020-08-20 15:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 017a7309f397cf538e1aec60b775eb25 SHA-1: 7a68737f167acfd75670dec9893fda65d631b5f0 SHA-256: ddaf7b92222ddf4a98c22f15562ded1e044fd64d4a93b81989acc2c18af580d4
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. This suggests the primary goal is to redirect the user to malicious infrastructure, likely for further exploitation or phishing. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/pify?keyword=ultrasound+guided+central+line+placement+cpt
    • http://files.iokb.us/uploads/1/3/1/0/131069934/3989772.pdf
    • https://cdn.shopify.com/s/files/1/0435/8835/4207/files/fodazejade.pdf
    • https://cdn.shopify.com/s/files/1/0435/3405/7621/files/vakazipe.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6278/files/6995794531.pdf
    • https://cdn.shopify.com/s/files/1/0440/5687/1062/files/4038086763.pdf
    • https://cdn.shopify.com/s/files/1/0431/2639/0946/files/nelafovajabe.pdf
    • https://cdn.shopify.com/s/files/1/0436/3298/4222/files/robodesusojo.pdf
    • https://cdn.shopify.com/s/files/1/0428/8797/0975/files/gentoo_handbook.pdf
    • https://cdn.shopify.com/s/files/1/0433/4351/1702/files/volvo_a25c_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/9110/7752/files/79631301462.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/
    • https://cdn.shopify.com/s/files/1/0440/5687/1062/f

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000070cd.bin
0d21d8584454de3264eb7dc7deb4406024040d0b44cadef7c803d9a1fe7c33e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70CD 5384 bytes
font_01_sfnt_off000082fd.bin
f7c6f51f60be96d44aacefcdbd85dc2f7542e407e8c56ed04799fa53f16de645		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82FD 15548 bytes

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