Malicious PDF — malware analysis report

Static analysis result for SHA-256 75cc39b3ec5a7394…

MALICIOUS

PDF

52.5 KB Created: 2020-08-17 02:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 308de9d70caad4854f5965c90235c1e3 SHA-1: 39c162ba7efe1ec07ac39875de4c93852474d8a4 SHA-256: 75cc39b3ec5a73943cd172fc5487506528fb26c1f24d845efd96582363133fdc
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The PDF_SEO_LINK_FARM heuristic further suggests a large number of external links, many of which are hosted on Shopify, potentially to obscure the malicious intent. The ML classifier also strongly flagged this PDF as malicious. The document body contains a URL that is also present in the list of embedded URLs, reinforcing the malicious redirection attempt.

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=coca+cola+brown+colour+da+song
    • http://zibok.morrellonline.com/uploads/1/3/0/8/130874308/5081794.pdf
    • http://ratuwi.jiangbirdnest.com/uploads/1/3/1/1/131163601/tudaxezo.pdf
    • http://files.oceansurfsounds.com/uploads/1/3/0/9/130970008/towoxuxewoka-zugis-vofiboni.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/8800/2710/files/coast_guard_awards_manual.pdf
    • https://cdn.shopify.com/s/files/1/0440/6899/5222/files/timenukujudopugumov.pdf
    • https://cdn.shopify.com/s/files/1/0433/5792/9623/files/tilikexotulekepelowu.pdf
    • https://cdn.shopify.com/s/files/1/0439/1596/8667/files/simplifying_algebraic_expressions_notes.pdf
    • https://cdn.shopify.com/s/files/1/0437/2883/0625/files/breast_cancer_project.pdf
    • https://cdn.shopify.com/s/files/1/0440/9714/2936/files/jafososirelaz.pdf
    • https://cdn.shopify.com/s/files/1/0450/7333/4424/files/joweza.pdf
    • https://cdn.shopify.com/s/files/1/0431/0928/6042/files/6219037857.pdf
    • https://cdn.shopify.com/s/files/1/0435/3651/5224/files/1994793729.pdf
    • https://cdn.shopify.com/s/files/1/0434/7287/9773/files/kafabukovizozegabepipi.pdf
    • https://cdn.shopify.com/s/files/1/0435/2016/3999/files/19516874820.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_off00008163.bin
cc76fe7b4a6b24637a4d6eac7af997af67da14c5c36c954cc8615a921a44794a
pdf-font-stream PDF embedded font (sfnt) at offset 0x8163 5244 bytes
font_01_sfnt_off00009346.bin
267ef778d2521492f1c7812ee1cefedd917966bba4fc45994971bddb9bd47e5b
pdf-font-stream PDF embedded font (sfnt) at offset 0x9346 15472 bytes