Malicious PDF — malware analysis report

Static analysis result for SHA-256 9918c774a793a722…

MALICIOUS

PDF

40.0 KB Created: 2020-08-30 04:40:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 60704627ac3243a8ec00a3bb8b34a792 SHA-1: 2b97e5e8a48db6693860b35ec24e1a3d5692a11a SHA-256: 9918c774a793a722593c40160dc554c6cd290d876b8c9de7c1836bf1fdfd8069
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to domains associated with link farms and redirectors. One critical heuristic identified a link to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, contains text related to 'exercicios de divisao de polinomios' and includes the malicious URL, suggesting a lure to trick users into clicking through to potentially harmful content. The file is generated by wkhtmltopdf, a tool often used to create SEO-optimized content, which aligns with the link farm heuristic.

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/wix?keyword=exercicios+de+divis%25C3%25A3o+de+polinomios
    • https://cdn.shopify.com/s/files/1/0429/8027/8426/files/ruwoj.pdf
    • https://cdn.shopify.com/s/files/1/0435/0741/7253/files/favagigisowotagozolevifi.pdf
    • https://cdn.shopify.com/s/files/1/0438/8470/7992/files/deezloader_remix_4._2._2.pdf
    • https://cdn.shopify.com/s/files/1/0438/2490/6400/files/durable_power_of_attorney_form_missouri.pdf
    • https://cdn.shopify.com/s/files/1/0431/6587/6379/files/thomas_calculus_1_solutions.pdf
    • https://static.usrfiles.com/ugd/b8c837_b9cb98e7aaa244ebb303e8d3e69481bb.pdf
    • https://static.usrfiles.com/ugd/b8c837_b9b8e4991ec045d8b6de4f5a599c76fe.pdf
    • https://static.usrfiles.com/ugd/8de238_36e557c1d47a4a4ab60962480165c02d.pdf
    • https://static.usrfiles.com/ugd/b8c837_48151c44e7f5418980e2c23affea03ec.pdf
    • https://static.usrfiles.com/ugd/b8c837_cfc2266b12354d6bb593e96dbaea740c.pdf
    • https://static.usrfiles.com/ugd/b8c837_e9a201ea9e9b486cbd7d8926f9c12019.pdf
    • https://static.usrfiles.com/ugd/b8c837_b541c3dd58224a26a8f053fce03d572c.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_off0000596f.bin
7665457eb0bb2f7e149c453e97d086c01e2d08354c9776da9260ca5cb77997d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x596F 5412 bytes
font_01_sfnt_off00006bc0.bin
87297132467fa5ec9759463e484b03df350d6258a4e3923af15b4ee9e59f2f03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BC0 12376 bytes

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