Malicious PDF — malware analysis report

Static analysis result for SHA-256 11e08b2726440d2b…

MALICIOUS

PDF

41.1 KB Created: 2020-08-11 19:15:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d3c5547fa71192c1ffcdff0b60b8acc SHA-1: 59f6332bfb5ce020475678f3bbd31f703c105193 SHA-256: 11e08b2726440d2b5d4d287deb4b2e534ce1efdd84434217069898cda7c96c61
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful infrastructure.

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=associa%25C3%25A7%25C3%25A3o+de+capacitores+em+serie+e+paralelo+pdf
    • http://filonana.nc3family.org/uploads/1/3/1/4/131407222/leduzuzazobib_rubenewoli_sajujebusak.pdf
    • http://files.crjuices.com/uploads/1/3/0/7/130775310/losodewusev_givigor.pdf
    • http://files.mrsheridanenglish.com/uploads/1/3/2/8/132814427/vasov.pdf
    • http://files.janie-gibson.com/uploads/1/3/1/8/131871980/6946831.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/3465/4358/files/cabling_network.pdf
    • https://cdn.shopify.com/s/files/1/0437/3010/8581/files/colloquial_english_phrases.pdf
    • https://cdn.shopify.com/s/files/1/0432/1384/8731/files/88531687051.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/9467339244.pdf
    • https://cdn.shopify.com/s/files/1/0439/0486/0328/files/resam.pdf
    • https://cdn.shopify.com/s/files/1/0430/6403/3429/files/83049703912.pdf
    • https://cdn.shopify.com/s/files/1/0429/4865/7311/files/49308390277.pdf
    • https://cdn.shopify.com/s/files/1/0433/5537/3720/files/mawiwiwofibudifala.pdf
    • https://cdn.shopify.com/s/files/1/0427/9818/6663/files/fatomezasexek.pdf
    • https://cdn.shopify.com/s/files/1/0433/3957/9546/files/17443244798.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_off00005e20.bin
e9dc3898b49380cc0dff024f3713294ca127afec9ec8532b8561852e640dc000
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E20 5788 bytes
font_01_sfnt_off000070d5.bin
0fd6a9f157322f5f25b131cb8f0a3607ec45350f8af4b267338abf418a45d012
pdf-font-stream PDF embedded font (sfnt) at offset 0x70D5 11932 bytes