Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d31c269c422b48a…

MALICIOUS

PDF

36.6 KB Created: 2020-08-29 10:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d1939affc56b305135f6a83620d1765 SHA-1: 276880e219fc1e2bc8ed918c7a6cc0e5b19d59a2 SHA-256: 7d31c269c422b48acecb9aad1162b36998454eefb49d3140515d62a5ec69eb2c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a significant number of embedded links, identified as a link farm. One of these links, 'https://ttraff.cc/wix?keyword=%25C3%25A9valuation+la+sym%25C3%25A9trie+cm1', is flagged as a known malicious redirector. The presence of a link farm suggests an attempt to lure users to malicious websites, likely for phishing or malware distribution. 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.cc/wix?keyword=%25C3%25A9valuation+la+sym%25C3%25A9trie+cm1
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_4f3c77502bd8481685a7886b86258d2a.pdf
    • https://static.usrfiles.com/ugd/b8c837_2af84211bd3b42d4a2fc601104296d2d.pdf
    • https://static.usrfiles.com/ugd/b8c837_fa60f998f3ca46a0a3a5118adb8edc6e.pdf
    • https://cdn.shopify.com/s/files/1/0437/5671/6183/files/48522002413.pdf
    • https://cdn.shopify.com/s/files/1/0434/6265/6165/files/sirusuderurofune.pdf
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/63956992818.pdf
    • https://cdn.shopify.com/s/files/1/0456/9146/9983/files/ririfiwivojabazedubabo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7731/2411/files/dugitofizugo.pdf
    • https://cdn.shopify.com/s/files/1/0434/7179/8424/files/todeg.pdf
    • https://cdn.shopify.com/s/files/1/0431/9812/0094/files/73168904082.pdf
    • https://cdn.shopify.com/s/files/1/0440/9180/1752/files/relieving_letter_format_in.pdf
    • https://cdn.shopify.com/s/files/1/0434/5787/2033/files/givixenulejibotirede.pdf
    • https://cdn.shopify.com/s/files/1/0433/2306/4488/files/hedging_strategies_using_futures_and_options.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_off00004cbc.bin
8a069a612fe1d0c82f9d22ce15d45aa0015071cfacb3439ae025b17f90751abd
pdf-font-stream PDF embedded font (sfnt) at offset 0x4CBC 5280 bytes
font_01_sfnt_off00005e62.bin
4385a6fc94fa2ebc897edfacb35b5176bd7070af343a9ff7cfdada5351e5e673
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E62 11812 bytes