Malicious PDF — malware analysis report

Static analysis result for SHA-256 636a7ad0aa479759…

MALICIOUS

PDF

38.8 KB Created: 2020-08-15 06:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1ca48b0052ffbfd52bb48679afb0bc6 SHA-1: 7bf7b0795dcfcafc646ddf1371c92277364ac4b1 SHA-256: 636a7ad0aa479759b514e15d307178fd0f7aebac4c9e205bc4dc9c85135d09a2
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.cc/wb?keyword=python%20selenium%20download%20pdf%20chrome'. Additionally, a 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document prompts the user to install a browser extension or update. This combination suggests a social engineering attack aimed at tricking the user into executing malicious code or revealing credentials. No scripts were extracted, but the presence of embedded URLs and the lure heuristic strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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=python%20selenium%20download%20pdf%20chrome
    • http://waxazu.road2gold.net/uploads/1/3/0/7/130775735/407f1ae22dc64.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/2492/5351/files/catamaran_rx_prior_authorization_form.pdf
    • https://cdn.shopify.com/s/files/1/0437/9007/4016/files/core_java_practice_programs_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0435/1898/4352/files/cambridge_english_prepare_level_1.pdf
    • https://cdn.shopify.com/s/files/1/0434/1134/1479/files/28744441715.pdf
    • https://cdn.shopify.com/s/files/1/0432/7371/5880/files/cisco_router_configuration_tool.pdf
    • https://cdn.shopify.com/s/files/1/0431/8068/7524/files/80358187033.pdf
    • https://cdn.shopify.com/s/files/1/0438/4181/4693/files/21322419136.pdf
    • https://cdn.shopify.com/s/files/1/0433/8565/1358/files/difference_between_accounting_concepts_and_conventions.pdf
    • https://cdn.shopify.com/s/files/1/0430/4103/0293/files/jokegufozenax.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/13652925252.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_off000057ba.bin
55a047325bc78c8ed8cf7a457b23902c87d052642b5241511945869a61c645a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57BA 5592 bytes
font_01_sfnt_off00006aa4.bin
b2d27a98a5060266c154fd96467d30265b1e3a70bb597d573234ab6616ccde0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AA4 10680 bytes

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