Malicious PDF — malware analysis report

Static analysis result for SHA-256 445a2e88e4245384…

MALICIOUS

PDF

48.7 KB Created: 2020-08-08 00:25:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c25753b778655afdd539102165f6fce SHA-1: 0d1b41eb6ab4a65fa5de46c31200d777a3de90cb SHA-256: 445a2e88e4245384e315c614e35b9c4af4c8803f61382d3946f043993f6aa15c
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.ru/pify?keyword=classroom+action+research+sample+pdf', likely serves as a lure to a malicious site. The PDF also contains a large number of external links, many pointing to benign Shopify domains, suggesting a link farm SEO tactic to improve search engine ranking for malicious content. The ML classifier strongly flagged this PDF as malicious.

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=classroom+action+research+sample+pdf
    • http://files.roastedcoffeeqc.com/uploads/1/3/1/6/131606858/tegoxete.pdf
    • http://files.bkdoula.com/uploads/1/3/0/8/130874035/305554.pdf
    • http://files.chinatownbranch.com/uploads/1/3/1/3/131380467/1307638.pdf
    • http://files.sharonbaptisthamptonva.com/uploads/1/3/1/6/131607054/7135786.pdf
    • http://files.utaps.org/uploads/1/3/2/3/132302764/96ba2d4fe7e3.pdf
    • https://cdn.shopify.com/s/files/1/0431/8520/9512/files/definite_articles_in_english_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0435/0446/8134/files/90147402110.pdf
    • https://cdn.shopify.com/s/files/1/0437/1880/3605/files/97833637431.pdf
    • https://cdn.shopify.com/s/files/1/0429/2499/8819/files/22841176681.pdf
    • https://cdn.shopify.com/s/files/1/0431/5119/6315/files/gezukawijula.pdf
    • https://cdn.shopify.com/s/files/1/0428/2574/4540/files/el_alienista_caleb_carr_descargar.pdf
    • https://cdn.shopify.com/s/files/1/0440/5883/7142/files/what_is_a_slug_in_wordpress.pdf
    • https://cdn.shopify.com/s/files/1/0432/2079/5556/files/20983538524.pdf
    • https://cdn.shopify.com/s/files/1/0434/0357/5454/files/radoladonexopirofizotozel.pdf
    • https://cdn.shopify.com/s/files/1/0429/0658/3203/files/16806812816.pdf
    • https://cdn.shopify.com/s/files/1/0432/1109/6221/files/ayushman_bharat_list.pdf
    • https://cdn.shopify.com/s/files/1/0433/5756/9176/files/14074177186.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007877.bin
c80b935bb2e72fbf0bb54bead4dcf673e2ee9ff5a06d35ab91e29c0786333a85
pdf-font-stream PDF embedded font (sfnt) at offset 0x7877 1696 bytes
font_01_sfnt_off000080a1.bin
0a19e6647f6b9b79f5f0fdd0788b916657fab9cf37909476becec03f5f25a300
pdf-font-stream PDF embedded font (sfnt) at offset 0x80A1 5300 bytes
font_02_sfnt_off00009279.bin
d0a13a4ab7842516db7f9fba4b16e20d57d07b52b563e563d10e3328ef9f01a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x9279 10176 bytes