Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e4bcc5c2692af62…

MALICIOUS

PDF

37.2 KB Created: 2020-08-16 19:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e18cb242c2289aebec1b76c35732f0c SHA-1: e6efb7d13885666302c3700c3f0807ec4b4d1d6f SHA-256: 7e4bcc5c2692af62ac2262f6af8f13fc6538efdf057c428e872be0a52cf816d0
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.cc'. It also exhibits characteristics of a PDF link farm, with numerous links to external PDFs, many hosted on Shopify. The document body, though heavily obfuscated, contains the text 'Blue facebook icon' and the malicious URL, suggesting a lure to trick users into clicking through to potentially malicious content. The presence of embedded URLs and the ML classifier's high confidence score support the malicious verdict.

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/pify?keyword=blue+facebook+icon
    • http://files.millhousefloristry.co.uk/uploads/1/3/2/7/132710753/nasinoja.pdf
    • http://vebuzili.seanoneillartist.com/uploads/1/3/1/6/131606490/235f88c19.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/4434/6792/files/61940827840.pdf
    • https://cdn.shopify.com/s/files/1/0436/0024/8995/files/candidiasis_oral_2020.pdf
    • https://cdn.shopify.com/s/files/1/0427/8022/9791/files/sixagibitinukexed.pdf
    • https://cdn.shopify.com/s/files/1/0427/4785/5004/files/530247084.pdf
    • https://cdn.shopify.com/s/files/1/0439/5394/6782/files/gubemugebenidatupanibez.pdf
    • https://cdn.shopify.com/s/files/1/0429/7146/3831/files/wujazezekudomasa.pdf
    • https://cdn.shopify.com/s/files/1/0428/7712/4774/files/definition_of_bullying.pdf
    • https://cdn.shopify.com/s/files/1/0427/6345/2583/files/dakixalibivatavolenotike.pdf
    • https://cdn.shopify.com/s/files/1/0434/3683/4968/files/7965963407.pdf
    • https://cdn.shopify.com/s/files/1/0434/8765/8141/files/depikujiroteziwu.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_off0000555f.bin
7a77cf3aa7d5694c860c72a6144aa825bcf100d4b1f01db7a42c905b4e558c4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x555F 4856 bytes
font_01_sfnt_off000065ff.bin
f8312666c5e0c80f718b19bd08ca63a64158dd1e735d8c7389307c47135fb539
pdf-font-stream PDF embedded font (sfnt) at offset 0x65FF 10088 bytes