Malicious PDF — malware analysis report

Static analysis result for SHA-256 4efc08bb5a45b7f0…

MALICIOUS

PDF

60.8 KB Created: 2020-09-02 06:37:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 037b3516f1d59702255255c01a28c47b SHA-1: f8af72f32a5a06e84cc997521634625dfe35ee52 SHA-256: 4efc08bb5a45b7f00b8e9ab4c0b967f2eea1d78930a450bc169fd33d8dc1fd41
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF file contains a large number of embedded links, many of which point to a redirector service. The primary malicious URL identified is https://ttraff.cc/wix?keyword=ibm+enterprise+design+thinking+field+guide, which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL and other links, suggesting a link farm or phishing lure. The presence of numerous external links, including one to a known malicious redirector, indicates an attempt to direct users to malicious infrastructure.

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=ibm+enterprise+design+thinking+field+guide
    • https://static.usrfiles.com/ugd/b8c837_c773afb0a1c040b3abcb07471c7f7c08.pdf
    • https://static.usrfiles.com/ugd/d902bb_51bba498b962450e975b9b0f28df8700.pdf
    • https://static.usrfiles.com/ugd/9edd50_e72edab5dc064721b464a23132679899.pdf
    • https://static.usrfiles.com/ugd/2f3ac6_226407ef108a4d30982dcda11eaae6d4.pdf
    • https://static.usrfiles.com/ugd/d54300_1842bd96072643f9bbd914d20a3bf317.pdf
    • https://static.usrfiles.com/ugd/b8c837_6714d82fa35f44c6a625d57ceb2ad1df.pdf
    • https://cdn.shopify.com/s/files/1/0428/6935/8758/files/zamudebidoxu.pdf
    • https://cdn.shopify.com/s/files/1/0436/0234/6148/files/xewulovofeguwidavepob.pdf
    • https://cdn.shopify.com/s/files/1/0428/6211/7020/files/sybex_cissp_practice_test.pdf
    • https://cdn.shopify.com/s/files/1/0433/1762/4990/files/2437651054.pdf
    • https://cdn.shopify.com/s/files/1/0432/9072/2454/files/69548877547.pdf
    • https://cdn.shopify.com/s/files/1/0431/8520/9506/files/sevifososokurowivik.pdf
    • https://cdn.shopify.com/s/files/1/0428/4815/7859/files/90128655247.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_off0000b106.bin
3cc91a045341d4a45d6fd5ff38c4cfece0431f481234553c32d7c6180324ccbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB106 5384 bytes
font_01_sfnt_off0000c326.bin
9b0a1bcb215e0ba5e48ada036d1b5951f4d5f6c5d6c84e70e260deeebfbc9630		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC326 10432 bytes

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