Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0e3f32546158f08…

MALICIOUS

PDF

44.5 KB Created: 2020-08-20 12:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c00f46086189615141f0203f599b1c68 SHA-1: db045b9ec3cb1c80785c3859820382689d3e312d SHA-256: d0e3f32546158f08ea66de285ff34eaf34b251d3a6aafb2c05c17dfa7ee00752
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, suggests a lure related to legal argumentation, likely to entice users to click the malicious link. The ML classifier also strongly indicated maliciousness. The primary IOC is the redirector URL, which is designed to lead users to further malicious content.

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.com/pify?keyword=curso+pr%25C3%25A1tico+de+argumenta%25C3%25A7%25C3%25A3o+jur%25C3%25ADdica+pdf
    • http://files.2319thestore.com/uploads/1/3/0/9/130969148/kaxutagu_rigax_resawemujetig_bejejujob.pdf
    • https://cdn.shopify.com/s/files/1/0428/9452/4579/files/bigenofilijodipabubu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9354/1535/files/ct_resale_certificate.pdf
    • https://cdn.shopify.com/s/files/1/0462/6645/0074/files/pokemon_generations_game_for_android_apk.pdf
    • https://cdn.shopify.com/s/files/1/0433/9240/1571/files/notability_vs_goodnotes_annotation.pdf
    • https://cdn.shopify.com/s/files/1/0435/3074/8055/files/wuvotapaduker.pdf
    • https://cdn.shopify.com/s/files/1/0436/9190/1081/files/agustin_garcia_calvo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2020/5726/files/cheat_engine_android_pubg_mobile.pdf
    • https://cdn.shopify.com/s/files/1/0438/1782/8512/files/16005399173.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_off0000689f.bin
3db8b83ccb769fec1bcc6851873bdc8c80c4737bea3bdbaf926275ad93d55765		 pdf-font-stream PDF embedded font (sfnt) at offset 0x689F 6212 bytes
font_01_sfnt_off00007c31.bin
c292ba0813933da268541848567dd43c734cde882ed5751995229c1afcae4fcf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C31 12880 bytes

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