Malicious PDF — malware analysis report

Static analysis result for SHA-256 5286aa9796bcc22f…

MALICIOUS

PDF

38.5 KB Created: 2020-08-29 18:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7e16057a187e49c82d9d8073561ac52c SHA-1: fdcb4e1723b0612b24bf6d0ce48113bfc63f46f5 SHA-256: 5286aa9796bcc22f8a2ce2a3306580d6559057c35f1d613fb1caaf776efdf907
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/wix?keyword=complete+subject+and+predicate+worksheets+pdf'. The document body also contains this URL, suggesting a lure to external content. The presence of numerous other links to PDF files hosted on static.usrfiles.com and cdn.shopify.com, while some are benign, indicates a potential link farm strategy to improve search engine ranking or distribute malicious content. No scripts were extracted from this sample.

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.com/wix?keyword=complete+subject+and+predicate+worksheets+pdf
    • https://static.usrfiles.com/ugd/b8c837_e490ffa8b99348539e3d4db015ec4373.pdf
    • https://static.usrfiles.com/ugd/80c1db_ab45fe2ce6014cb7bc5fd992625542b0.pdf
    • https://static.usrfiles.com/ugd/576447_a4b4c9a943b44363a5274506e65cbc4d.pdf
    • https://static.usrfiles.com/ugd/cec570_2264d09bbed7419199f149fd255dd695.pdf
    • https://static.usrfiles.com/ugd/b8c837_0d7f62b6f81141dda8cfe8bf027d8c86.pdf
    • https://static.usrfiles.com/ugd/b8c837_f6dc46405b074502859cef609ce0d915.pdf
    • https://cdn.shopify.com/s/files/1/0446/3771/6643/files/extreme_sports_esl_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0445/6900/2143/files/gw2_wvw_builds.pdf
    • https://cdn.shopify.com/s/files/1/0435/0751/5558/files/24635341708.pdf
    • https://cdn.shopify.com/s/files/1/0434/0989/9670/files/48162782491.pdf
    • https://cdn.shopify.com/s/files/1/0432/2754/5755/files/vijipowoguxininuve.pdf
    • https://cdn.shopify.com/s/files/1/0432/3724/5086/files/zolakapomukomunakez.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_off0000573a.bin
344b241f34da19c110dab3d121cd6e9745445af6f6ba279e8a02d3879a8ac59c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x573A 5672 bytes
font_01_sfnt_off00006a65.bin
96670e872a83bc97a31bebc5b06a9c29cdd38ff813a9db68adfd6eaeb6006b69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A65 10260 bytes

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