Malicious PDF — malware analysis report

Static analysis result for SHA-256 99718444ca41ad67…

MALICIOUS

PDF

52.9 KB Created: 2020-08-01 04:32:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f8caf08725faa1a266827163a3ab6d2 SHA-1: 58405e308ba6c985cdc4334fd45887be7dec89a5 SHA-256: 99718444ca41ad67b55fd910d3cea3543487f17a709c2c3244f6160845c61a9d
150 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. This suggests a link farm or SEO poisoning tactic designed to lead users to malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated, but the presence of the malicious redirector is a high-confidence indicator of malicious intent.

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=cat+banner+minecraft
    • http://files.mtvernonpentecostal.com/uploads/1/3/1/6/131636737/nexub.pdf
    • http://files.ideadokan.jp/uploads/1/3/1/4/131407233/9323100.pdf
    • http://files.codsallhistory.com/uploads/1/3/0/7/130775011/ganewezexix.pdf
    • https://cdn.shopify.com/s/files/1/0428/7656/7711/files/56986366959.pdf
    • https://cdn.shopify.com/s/files/1/0435/0427/1524/files/198506731.pdf
    • https://cdn.shopify.com/s/files/1/0430/6337/8081/files/a_course_in_combinatorics.pdf
    • https://cdn.shopify.com/s/files/1/0432/9160/7190/files/69280414896.pdf
    • https://cdn.shopify.com/s/files/1/0431/6394/3067/files/96119661501.pdf
    • https://cdn.shopify.com/s/files/1/0429/9502/4025/files/felapagavojeselepepu.pdf
    • https://cdn.shopify.com/s/files/1/0428/3337/9487/files/22028824659.pdf
    • https://cdn.shopify.com/s/files/1/0433/7490/3452/files/63913429018.pdf
    • https://cdn.shopify.com/s/files/1/0430/7088/1946/files/widazuxejesemunevu.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_off00009285.bin
330f7ef4d310bb41935d03f63376a32ea65288f18f88a0cea65946cfebb65832		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9285 4860 bytes
font_01_sfnt_off0000a2f7.bin
f63da2793fb8ce3ba249f8ce629aca00081633629c39c79e41697def312cbc10		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2F7 10668 bytes

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