Malicious PDF — malware analysis report

Static analysis result for SHA-256 90bc76c74958df5e…

MALICIOUS

PDF

38.2 KB Created: 2020-09-04 18:38:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00e4dc84954d3d8d8524d2701a288e6b SHA-1: 6c413faa73628aa42f629b0062d72994dbd3050c SHA-256: 90bc76c74958df5e97f2f66178a046bee132e999c0ce196f2f9fceeaace34fba
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Grade 3 spelling test worksheets' and a URL that appears to be a lure. The primary malicious URL identified is https://ttraff.club/wix?keyword=grade+3+spelling+test+worksheets, which is likely used to redirect the user to a malicious site. The PDF also contains a large number of links to Shopify domains, likely part of a link farm to improve SEO for the malicious redirector.

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.club/wix?keyword=grade+3+spelling+test+worksheets
    • https://cdn.shopify.com/s/files/1/0429/6769/5511/files/13375774081.pdf
    • https://cdn.shopify.com/s/files/1/0433/4524/8421/files/zutixumavosodisi.pdf
    • https://cdn.shopify.com/s/files/1/0433/4967/2091/files/47393079444.pdf
    • https://cdn.shopify.com/s/files/1/0440/4995/7029/files/99534586236.pdf
    • https://static.usrfiles.com/ugd/1da05d_a429e85d8c724178aade3473f4dd3c3d.pdf
    • https://cdn.shopify.com/s/files/1/0440/8036/5720/files/dodomojobodufe.pdf
    • https://cdn.shopify.com/s/files/1/0437/6687/4266/files/bufatu.pdf
    • https://cdn.shopify.com/s/files/1/0448/0922/4354/files/19688248173.pdf
    • https://cdn.shopify.com/s/files/1/0431/7003/7911/files/cadillac_escalade_2020_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/5041/8847/files/80711582676.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_off00005714.bin
d36ddcb4724ba3342858d71aa73f8e34164e0d37eb74da97449dff66545d7d05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5714 5572 bytes
font_01_sfnt_off00006a15.bin
7cae1bffb3a013bb3f2907c9c62010939def278434a8beca55eb284514527c94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A15 10080 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.