Malicious PDF — malware analysis report

Static analysis result for SHA-256 66de4373d3648b3e…

MALICIOUS

PDF

35.6 KB Created: 2020-08-15 15:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 915d0d627a31e5cd62d04754f8a32883 SHA-1: 3a5999edc3632ef5ba84ca570c85761139f368ff SHA-256: 66de4373d3648b3e70b03f25dfc3d717c5b879e49bcf114ebdef9eb3540e5572
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.cc, which is disguised as an 'lpg co2 system manual'. The document also hosts a large number of external PDF links, many of which are hosted on Shopify, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and the presence of embedded URLs indicate a potential for malicious redirection or further payload delivery.

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=lpg%20co2%20system%20manual
    • http://files.kittsonskitchen.com/uploads/1/3/1/8/131856232/a37fa16fe42.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/7728/6565/files/88407523831.pdf
    • https://cdn.shopify.com/s/files/1/0431/7069/3284/files/cornelius_castoriadis_biografia.pdf
    • https://cdn.shopify.com/s/files/1/0429/5639/0551/files/53655514948.pdf
    • https://cdn.shopify.com/s/files/1/0432/3190/3902/files/taiwan_rail_map.pdf
    • https://cdn.shopify.com/s/files/1/0430/5082/7929/files/dadaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/2537/5127/files/scanned_to_editable_word_converter_online_free.pdf
    • https://cdn.shopify.com/s/files/1/0440/7413/9813/files/zitoratamakaj.pdf
    • https://cdn.shopify.com/s/files/1/0435/8986/1535/files/zepezorinuvazofajoxewelu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5312/9640/files/gazefowaxijupakofufikurav.pdf
    • https://cdn.shopify.com/s/files/1/0434/5466/0758/files/57422167248.pdf
    • https://cdn.shopify.com/s/files/1/0427/4742/9031/files/85323849460.pdf
    • https://cdn.shopify.com/s/files/1/0431/6191/1460/files/32837789289.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_off00004cf9.bin
3fc4c0736ec18b1b2da042183869ab067918f7ddce24c230b5b0f7da0ccb455c
pdf-font-stream PDF embedded font (sfnt) at offset 0x4CF9 5332 bytes
font_01_sfnt_off00005f19.bin
2a8f6349692a7e862dc0b2630ac00f0e642cd998e90d3d8757edea682aca26cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F19 10184 bytes