Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ada8302ac50489d…

MALICIOUS

PDF

57.7 KB Created: 2020-07-30 17:28:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bbb3b64805da158aa78ee836d3d402bc SHA-1: 305bda16300c49da944076f9fc8d7d542ddb0d7c SHA-256: 4ada8302ac50489dcf9029eb9d9c6a932b1ed3d18ec2cae81c114d5a502a580f
150 Risk Score

Malware Insights

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

The PDF file contains a mass of external links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The embedded links, particularly the one to 'ttraff.cc', suggest an attempt to lure the user to a malicious site, likely for further exploitation or credential harvesting. The document body is heavily obfuscated and appears to be junk data, but the presence of 'wkhtmltopdf' suggests it was generated programmatically.

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.cc/pify?keyword=sepsis+trust+guidelines+pdf
    • http://files.artisanbuiltins.com/uploads/1/3/1/6/131606345/lalazafonovukadej.pdf
    • http://files.alex-chien.com/uploads/1/3/0/7/130739826/3065533.pdf
    • http://files.ss4js.com/uploads/1/3/2/6/132683154/xufavudu-berosepopev.pdf
    • https://cdn.shopify.co
    • https://cdn.shopify.com/s/files/1/0434/8048/1954/files/67850140298.pdf
    • https://cdn.shopify.com/s/files/1/0431/9854/6082/files/51553074277.pdf
    • https://cdn.shopify.com/s/files/1/0429/2296/7207/files/fuwominixo.pdf
    • https://cdn.shopify.com/s/files/1/0433/4636/2523/files/berulizotujapir.pdf
    • https://cdn.shopify.com/s/files/1/0430/6989/8909/files/86319144340.pdf
    • https://cdn.shopify.com/s/files/1/0428/3544/3871/files/nigewagowejabadibaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/8770/8825/files/43482416508.pdf
    • https://cdn.shopify.com/s/files/1/0435/1574/0312/files/36862408496.pdf
    • https://cdn.shopify.com/s/files/1/0435/5388/2280/files/vunafotolomix.pdf
    • https://cdn.shopify.com/s/files/1/0429/5321/2060/files/52150098826.pdf
    • https://cdn.shopify.com/s/files/1/0427/8157/3279/files/pisonanudag.pdf
    • https://cdn.shopify.com/s/files/1/0431/3382/9277/files/bupejibumukivimo.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_off0000a60f.bin
1307498ec5878b639e4e81898a5fc3caa40186e3fa8e152dd3fdd0f1780e3fd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA60F 4872 bytes
font_01_sfnt_off0000b6aa.bin
b8716304bedd8c28bd32446fd39a026b445695f5712ee9476cfde54bb9cd32f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB6AA 10272 bytes

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