Malicious PDF — malware analysis report

Static analysis result for SHA-256 909bd516dbe3f71c…

MALICIOUS

PDF

57.6 KB Created: 2020-08-29 13:30:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f89a05881c3243a11a4a74c91dab47d SHA-1: de0519bbc117565e32bb9e0959175d8dea62fc52 SHA-256: 909bd516dbe3f71cc5a352159d153f8f70436ed0de9adce552e1e107aba1081e
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/wix?keyword=algebra+1+staar+released+test+2015', is designed to lead users to malicious infrastructure. The document also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external PDF files, suggesting an attempt to manipulate search engine results or distribute further malicious content.

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=algebra+1+staar+released+test+2015
    • https://static.usrfiles.com/ugd/b8c837_77bc6dec948540dc8be5515f749ffefa.pdf
    • https://static.usrfiles.com/ugd/ba3095_603fd13ebe314107bbbaae7428a3753a.pdf
    • https://static.usrfiles.com/ugd/b8c837_39a44fc9681047a7a18a1bb62915b09d.pdf
    • https://static.usrfiles.com/ugd/b8c837_1ae9e16d59ed47b1b9ebd420543c6745.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/juzopuzenafososokazulu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3002/8194/files/25762839303.pdf
    • https://cdn.shopify.com/s/files/1/0428/9213/2508/files/leaf_apices.pdf
    • https://cdn.shopify.com/s/files/1/0430/7828/7513/files/tiendas_de_ropa_mixcalco_chamarras.pdf
    • https://cdn.shopify.com/s/files/1/0430/9506/4730/files/kadambini_patrika.pdf
    • https://static.usrfiles.com/ugd/b8c837_fd4b319d51fe4425b795c71f3345c35d.pdf
    • https://static.usrfiles.com/ugd/9c43ec_fe901df0a3e84ef68eb3404d849adf78.pdf
    • https://static.usrfiles.com/ugd/b8c837_81a30c15573c4d93b5b754f527edbcfe.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_off0000a4e6.bin
456aef35b8c2da6e11a5af14c42a9e2aca76433885f9bacf1b8150c5f1ffd2fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4E6 5572 bytes
font_01_sfnt_off0000b7e0.bin
94e3f26373dad32290e7660a42f71681885f76193f461ded3d6b9ba52c7ec879		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E0 9980 bytes

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