Malicious PDF — malware analysis report

Static analysis result for SHA-256 c59f91a8d27fc5ff…

MALICIOUS

PDF

40.2 KB Created: 2020-08-20 22:31:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b8c0ca2578b4ca08b4f1ef124908f35 SHA-1: 32f072dda9931f4e0aa9b73f42bc5a9d16674622 SHA-256: c59f91a8d27fc5ff682631335282cdc54a163ad66d2564d9cfd745fcfeb171ea
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including one pointing to known malicious redirector infrastructure at ttraff.ru. The document body, though heavily obfuscated, contains text related to 'Algebra 2 exam review answers' and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector attack.

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.ru/pify?keyword=algebra+2+exam+review+answers
    • http://birasob.pral153.co.uk/uploads/1/3/1/8/131871726/101752c53ce2.pdf
    • https://cdn.shopify.com/s/files/1/0448/2433/0402/files/zozex.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rabilividobakomitunaxizug.pdf
    • https://cdn.shopify.com/s/files/1/0434/6393/4109/files/45201924961.pdf
    • https://cdn.shopify.com/s/files/1/0432/0067/6001/files/29723160906.pdf
    • https://cdn.shopify.com/s/files/1/0430/8425/1285/files/nibixeliwuferoxirediwal.pdf
    • https://cdn.shopify.com/s/files/1/0429/8568/5153/files/94181158212.pdf
    • https://cdn.shopify.com/s/files/1/0435/5325/9679/files/87027481467.pdf
    • https://cdn.shopify.com/s/files/1/0430/3588/5725/files/inside_al_qaeda_and_taliban.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_off00005df5.bin
d9c7fd32858a63ef7f3802dde3650a12cac0c2828106e880fca6e0c69a02d233		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DF5 5484 bytes
font_01_sfnt_off0000709b.bin
c77e0602dfcf131c6c4d452e0cc688ffeb5191473308db52949f2ddd105c0448		 pdf-font-stream PDF embedded font (sfnt) at offset 0x709B 10668 bytes

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