Malicious PDF — malware analysis report

Static analysis result for SHA-256 517934deef91f2f6…

MALICIOUS

PDF

36.7 KB Created: 2020-08-19 08:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0361b09e03ab1fe82f5f647258517c73 SHA-1: 7b2fd16f0bcd5cd3679bb3637f2b6722234c569f SHA-256: 517934deef91f2f653c7db40070e8b9bc300b93d8fb9922075c731edc0e7192d
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=chegou+o+avivamento+trio+nascimento'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links to other PDF files hosted on various domains, including Shopify. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring the user to click on the malicious redirector URL, likely to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=chegou+o+avivamento+trio+nascimento
    • http://files.tobaccobarnfarm.com/uploads/1/3/2/7/132741486/9608579.pdf
    • http://files.backdoormission.ca/uploads/1/3/1/6/131637273/f40cf99.pdf
    • http://files.metroweather.com/uploads/1/3/0/7/130740069/nonavilujapukox.pdf
    • http://ladub.canesband.org/uploads/1/3/0/8/130873987/943066.pdf
    • https://cdn.shopify.com/s/files/1/0439/6879/0686/files/tajejamotitadosi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3141/2379/files/47856461327.pdf
    • https://cdn.shopify.com/s/files/1/0431/7901/6360/files/c_o_form_e_y_quyn.pdf
    • https://cdn.shopify.com/s/files/1/0435/0096/1947/files/18263060647.pdf
    • https://cdn.shopify.com/s/files/1/0435/3048/5912/files/zofunas.pdf
    • https://cdn.shopify.com/s/files/1/0431/5080/3099/files/aeronautical_information_service.pdf
    • https://cdn.shopify.com/s/files/1/0428/9062/5191/files/85602755323.pdf
    • https://cdn.shopify.com/s/files/1/0427/5296/6812/files/99328702952.pdf
    • https://cdn.shopify.com/s/files/1/0433/8951/7978/files/64980298905.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/68905528383.pdf
    • https://cdn.shopify.com/s/files/1/0432/3013/4427/files/kurubipilekuvalaxepijogum.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004fd6.bin
eff406ea9ba22f6051bf9af2690af433d6c2949667d0381b32433148cd7cbbed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FD6 5144 bytes
font_01_sfnt_off00006140.bin
79bb5db5b3cb40ae4dd9f51c5450714012bde7a60ab9714f9bea9ac900767887		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6140 11004 bytes

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