Malicious PDF — malware analysis report

Static analysis result for SHA-256 9baf23fdf9cd47e6…

MALICIOUS

PDF

41.0 KB Created: 2020-08-30 14:18:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b555ca214bc4ca2a2b906336dc53911f SHA-1: 3d51bd4c8b876b26c9196cdf7500e6dba93fb18f SHA-256: 9baf23fdf9cd47e6fb960140e2d691674966007e83e9e0c20daa9df9db2d312b
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one prominent link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the target URL which appears to be a lure related to 'nvidia quadro fx 3800'. The primary attack pattern involves redirecting the user to malicious infrastructure. No scripts were extracted from this sample.

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/wix?keyword=nvidia+quadro+fx+3800
    • https://static.usrfiles.com/ugd/ceb2e8_c77acfc766d04a7184a6b4480c310eb4.pdf
    • https://static.usrfiles.com/ugd/b8c837_324eabb27b67418593593c50426704ce.pdf
    • https://static.usrfiles.com/ugd/b8c837_960112edbdbf4e43a1dc4431a4aea00f.pdf
    • https://static.usrfiles.com/ugd/b8c837_abcc28a4d8af49968202b82dd3743905.pdf
    • https://static.usrfiles.com/ugd/ea78e0_f56d16b1c2b143f8b3eda3368407c78a.pdf
    • https://static.usrfiles.com/ugd/43d598_a598e247ba6846e0897a736920c77ed1.pdf
    • https://static.usrfiles.com/ugd/f65518_3a0d63498a5f43b6aa57539e709440a7.pdf
    • https://static.usrfiles.com/ugd/f14cf6_16fce82fd05e40fa831d0215ef82b82b.pdf
    • https://static.usrfiles.com/ugd/b8c837_5ab88d13d7d44d0288ab190757688216.pdf
    • https://cdn.shopify.com/s/files/1/0437/1179/1253/files/characteristics_of_every_accounting_information_system.pdf
    • https://cdn.shopify.com/s/files/1/0463/0278/9789/files/bamozutinisomerotobuzul.pdf
    • https://static.usrfiles.com/ugd/36f25b_f112311a31664d348d499ec02e48915c.pdf
    • https://static.usrfiles.com/ugd/b8c837_9f519e095f76478abb2581925e1b4bc7.pdf
    • https://static.usrfiles.com/ugd/9e53d4_edb37430b99743099ad6643d143e487e.pdf
    • https://static.usrfiles.com/ugd/b8c837_439cb3377941494f903a4dad124ae329.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_off000052ed.bin
168d096bdf92d641cce581760b96dbcd73f6fe5e79a74f4db351a01a0dc8a612		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52ED 4992 bytes
font_01_sfnt_off000063f7.bin
6809240c4a3a970754c58f766bbf949ffc31b98e1ea8ff052a41dcb1f710450a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63F7 11352 bytes
font_02_sfnt_off00008939.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8939 4324 bytes

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