Malicious PDF — malware analysis report

Static analysis result for SHA-256 05fbffe0aa6b5b49…

MALICIOUS

PDF

39.2 KB Created: 2020-08-20 06:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0059d89028f0f82a9a1415225d968f4 SHA-1: ae94e9c57616d504a1a7d58ec73d4aad6aadccbb SHA-256: 05fbffe0aa6b5b49bf5e8666b7f101147e8591f64b4b2960fb43ba0201657c98
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, disguised with a plausible lure related to employee self-evaluations. The document also functions as a link farm, pointing to numerous other PDFs hosted on Shopify, some of which are benign and others unknown. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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.com/pify?keyword=employee+self+evaluation+sample+answers+customer+focus
    • http://files.almarshellindustries.com/uploads/1/3/1/4/131409717/8641594.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/3421/4561/files/print_2d_array_java.pdf
    • https://cdn.shopify.com/s/files/1/0431/1321/8199/files/aspects_of_human_development.pdf
    • https://cdn.shopify.com/s/files/1/0433/6241/8846/files/42159196211.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99289858455.pdf
    • https://cdn.shopify.com/s/files/1/0429/7143/1065/files/wugupozavet.pdf
    • https://cdn.shopify.com/s/files/1/0427/9762/9596/files/tajebipofuzofun.pdf
    • https://cdn.shopify.com/s/files/1/0430/3532/8663/files/49251792612.pdf
    • https://cdn.shopify.com/s/files/1/0435/2465/3224/files/18678233276.pdf
    • https://cdn.shopify.com/s/files/1/0432/9452/3552/files/66983881871.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_off00005c10.bin
f6a877be3012c2d84e21cd86376894702217e0abaf57eebdf2c32421e50cccde		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C10 5372 bytes
font_01_sfnt_off00006e61.bin
e2ac714116b90f5181ae19c74c05556617d65ecce292ef30763397b9212231b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E61 9828 bytes

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