Malicious PDF — malware analysis report

Static analysis result for SHA-256 71f0045473491d52…

MALICIOUS

PDF

39.3 KB Created: 2020-08-24 16:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 038862dfcaf36a06bdd105dfc45cebf0 SHA-1: a23a7b4b76f364b485301c3664e2fbc0044527af SHA-256: 71f0045473491d528e40bd3784bf4f8aa78b0cca79500964d25c52153b53564c
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation. One of the primary links, 'https://ttraff.ru/pify?keyword=vacation+trip+planner+template', is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to the vacation trip planner template lure and the malicious redirector URL.

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.ru/pify?keyword=vacation+trip+planner+template
    • http://files.ameliakatjohnson.com/uploads/1/3/1/3/131379325/wamijudop_semeto.pdf
    • http://files.spinaespresso.com.au/uploads/1/3/1/6/131606630/nesuwi.pdf
    • http://files.themealsmaven.com/uploads/1/3/0/9/130969204/xopaturuwiz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/6138/6147/files/fepaxozovexulod.pdf
    • https://cdn.shopify.com/s/files/1/0449/6916/4968/files/suzonoxuturewegiv.pdf
    • https://cdn.shopify.com/s/files/1/0434/1802/6141/files/jeliduwalogam.pdf
    • https://cdn.shopify.com/s/files/1/0437/9056/5537/files/nhie_home_inspection_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/3638/5175/files/4177109436.pdf
    • https://cdn.shopify.com/s/files/1/0438/4977/7312/files/dafujagewefozebolitim.pdf
    • https://cdn.shopify.com/s/files/1/0432/3957/1616/files/54708918329.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_off00005f0c.bin
5c20af318a0d6b4dc77d021aecf4d7cbb9229ece6cf6f6f52b1c504b54501def
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F0C 4868 bytes
font_01_sfnt_off00006f7f.bin
1e37c73755817a012fc14e395e291847f74ea162ef3dff865979640793b486e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F7F 9776 bytes