Malicious PDF — malware analysis report

Static analysis result for SHA-256 38db0526dffaca31…

MALICIOUS

PDF

42.8 KB Created: 2020-08-30 19:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0f8ebea09733db135a56d9814355e59 SHA-1: cac3b4cbbd4eb1d3929e68721bdadae03706cedf SHA-256: 38db0526dffaca318afb76a85f291d1aded6547df17786a3e40df98bf1306eba
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link pointing to 'ttraff.ru' with a keyword suggesting a Medicaid card download, indicating a phishing or scam lure. The document body, though partially garbled, also contains this URL. The presence of numerous embedded links, many pointing to Shopify and static.usrfiles.com domains, suggests a link farm designed to obscure the malicious redirector. The ML classifier also 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/wix?keyword=download+medicaid+card
    • https://cdn.shopify.com/s/files/1/0433/9430/2117/files/luluwaworene.pdf
    • https://cdn.shopify.com/s/files/1/0431/1079/3370/files/goxugusapubutedufajas.pdf
    • https://cdn.shopify.com/s/files/1/0437/6346/6391/files/82772755299.pdf
    • https://cdn.shopify.com/s/files/1/0462/3466/5114/files/what_does_commendable_performance_mean.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mokotutirajozejimus.pdf
    • https://static.usrfiles.com/ugd/b65acf_17c1298989c84f0aa97f368482ac7c7a.pdf
    • https://static.usrfiles.com/ugd/a91264_9dcf1e350b054d24a5eff838941a08af.pdf
    • https://static.usrfiles.com/ugd/b8c837_1c8f0f166b774fa6be07bed4b8b3d198.pdf
    • https://static.usrfiles.com/ugd/b8c837_66c63703024c45c3942bc6ac7713b1aa.pdf
    • https://static.usrfiles.com/ugd/b8c837_fffc3add1a194ecb8ad92f23bd26b7d5.pdf
    • https://static.usrfiles.com/ugd/9cc572_84183572028a463896746d5b7f160de6.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_off00006b39.bin
d42f6ead4b40d463ee64d2178aede1bb96e616920224a6451d54858317f87dbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B39 4996 bytes
font_01_sfnt_off00007c2e.bin
883b416f52d6ef4ee2c74e222714be74a14b03906ca703d9e0322684ded87391		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C2E 10108 bytes

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