Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0091280dcece113…

MALICIOUS

PDF

39.7 KB Created: 2020-08-29 10:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcd102939049ac4b1c90a3c3afab7644 SHA-1: f1dc2fb972de18c8a5d09993b9d29376c6560d74 SHA-256: a0091280dcece113da0cbc9a9e9cc35673cb4fcc9b659ee73cfe63a4854ebe95
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.me/wix?keyword=go+pro+eric+worre+event+2019'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many pointing to static.usrfiles.com. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same redirector URL, reinforcing its 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.me/wix?keyword=go+pro+eric+worre+event+2019
    • https://cdn.shopif
    • https://static.usrfiles.com/ugd/b8c837_9fa7436b38b74139a51249956fe8d110.pdf
    • https://static.usrfiles.com/ugd/b8c837_af8fa704304b4653b0b469395695a601.pdf
    • https://static.usrfiles.com/ugd/b8c837_122c8ffb822842fb91337fd11e7ec27c.pdf
    • https://static.usrfiles.com/ugd/b8c837_d50be2bc83cb4fbfa2652433e6701777.pdf
    • https://cdn.shopify.com/s/files/1/0439/0970/9976/files/27749365876.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8003629611.pdf
    • https://cdn.shopify.com/s/files/1/0428/9291/8937/files/98332210554.pdf
    • https://static.usrfiles.com/ugd/b8c837_20bbe3f36a484a43a8c1ce7aeb723816.pdf
    • https://static.usrfiles.com/ugd/b8c837_b4bb41c7ee6b4b35a794a79d73f2bfab.pdf
    • https://static.usrfiles.com/ugd/b8c837_9616aa18dc914bb6bb01111b6d486959.pdf
    • https://cdn.shopify.com/s/files/1/0430/8962/5241/files/69030971002.pdf
    • https://cdn.shopify.com/s/files/1/0432/3006/8894/files/24828116749.pdf
    • https://cdn.shopify.com/s/files/1/0431/7485/4812/files/accounting_techniques.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31931154882.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_off00005e05.bin
08de7a5cf6a1edf21bc7d899bc303d13caa2674e8502be428b29955c5a7b29d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E05 5172 bytes
font_01_sfnt_off00006fd6.bin
43218494603be4523a48377fe03df5d11783a863fbc7acaaf1d59501ab15477d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FD6 9948 bytes