Malicious PDF — malware analysis report

Static analysis result for SHA-256 a46ec4c598545bb4…

MALICIOUS

PDF

39.8 KB Created: 2020-08-29 02:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1398f9dbed594909c97699b7e4ea61c SHA-1: 9d71c800796c93c76d90f8a2c1e08ce078e77eba SHA-256: a46ec4c598545bb423d6836ef079155d061d9464004232c281ac0969d2f5475f
150 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a large number of external links, characteristic of a link farm. One of these links, https://ttraff.cc/wix?keyword=royal+griffin+ark, is identified as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting it is the primary lure. The presence of a malicious redirector indicates an attempt to lead the user to a harmful destination.

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=royal+griffin+ark
    • https://static.usrfiles.com/ugd/b8c837_1b4d7c4dab224d76b2e14f7421a77c99.pdf
    • https://static.usrfiles.com/ugd/b8c837_3579f1eaa1a540fa988f446b4ca57a85.pdf
    • https://static.usrfiles.com/ugd/b8c837_aadeb2e488894cd59f939b3042c55c3f.pdf
    • https://static.usrfiles.com/ugd/b8c837_63e69173a194444a94af18c03d77571b.pdf
    • https://static.usrfiles.com/ugd/b8c837_c5e2d96e8b664eca90f671195c5a7cb4.pdf
    • https://static.usrfiles.com/ugd/b8c837_8c1f3fb7df974c00b7f3a8f0f9b5b514.pdf
    • https://static.usrfiles.com/ugd/b8c837_64df84e35a654103865d3f2689747e08.pdf
    • https://static.usrfiles.com/ugd/b8c837_d67d8056b5154b03857102a7e4b00ac6.pdf
    • https://static.usrfiles.com/ugd/b8c837_2762b56172ef4ef8bb40c865dfa9f22b.pdf
    • https://cdn.shopify.com/s/files/1/0429/8289/9871/files/c_adjacency_matrix.pdf
    • https://cdn.shopify.com/s/files/1/0434/4912/2983/files/86513782181.pdf
    • https://cdn.shopify.com/s/files/1/0433/8925/5847/files/9042010394.pdf
    • https://static.usrfiles.com/ugd/b8c837_c2c33be4e9054e7ab1484c88756a0f58.pdf
    • https://static.usrfiles.com/ugd/b8c837_77d22d6f68544e30a107b0c1d775dceb.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_off00005e41.bin
358f639619d8d735c867c4a804250ffe3de04b05aef9995742a28af2c89aa3fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E41 4928 bytes
font_01_sfnt_off00006f29.bin
db79c33ecec4cabad6b1a95c9b457dc4f09fbcb10219a307119a2c51094cdb71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F29 11248 bytes

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