Malicious PDF — malware analysis report

Static analysis result for SHA-256 c240bb1a8ae64415…

MALICIOUS

PDF

39.5 KB Created: 2020-08-31 05:24:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0707213166487f3245f42c29af7315f SHA-1: 3a186615fd9e114d89c527a16ab14890f93ec456 SHA-256: c240bb1a8ae64415f43b06cc71e1fc8f0af2219870e0490cc9dc36be44e87b10
150 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.com/wix?keyword=icse+full+form+in+tamil'. The document body, though heavily obfuscated, also contains this URL, suggesting it's a primary lure. The presence of a large number of external links, many hosted on Shopify, indicates an attempt to obscure the final malicious destination and potentially leverage SEO techniques for distribution.

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.com/wix?keyword=icse+full+form+in+tamil
    • https://static.usrfiles.com/ugd/49be48_80addb10393e4008a47b30c629f526d9.pdf
    • https://static.usrfiles.com/ugd/91e123_fff5e07831d7434c8bb4b7ea775125c1.pdf
    • https://static.usrfiles.com/ugd/b8c837_a1e84343a25045e0af5817545cbc537a.pdf
    • https://static.usrfiles.com/ugd/b8c837_23ff7ac0614c439492cf69df7c255c09.pdf
    • https://static.usrfiles.com/ugd/e3ff21_00bb5c17ba064b998052e853d23c6c01.pdf
    • https://cdn.shopify.com/s/files/1/0428/9586/8057/files/gilewedefotu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8734/7364/files/64323197760.pdf
    • https://cdn.shopify.com/s/files/1/0428/5743/1196/files/36232663502.pdf
    • https://cdn.shopify.com/s/files/1/0435/8871/4653/files/thiruttu_vcd_movies.pdf
    • https://cdn.shopify.com/s/files/1/0433/8148/9829/files/93067539016.pdf
    • https://cdn.shopify.com/s/files/1/0429/4007/2092/files/84932652417.pdf
    • https://cdn.shopify.com/s/files/1/0427/8072/1311/files/65064438722.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_off00005d8b.bin
0d63ad84c163ea2f01f7580e540e4b02a82fb12b7ebefbbc847385307f54b7cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D8B 4964 bytes
font_01_sfnt_off00006e41.bin
5e8251b61ad8a705c59fa08761c790fe1f163bf8df3d8ea6a07fa5ac4a36097d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E41 10376 bytes

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