Malicious PDF — malware analysis report

Static analysis result for SHA-256 873e31c912925f35…

MALICIOUS

PDF

35.2 KB Created: 2020-08-23 19:15:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a43b6aaa08da044a09b63c24823ede1 SHA-1: c85a1ee2fad0c04d1c8a06f1e25f8d336a0cb763 SHA-256: 873e31c912925f358e5d962a52ee1f2e04acccf4535c6c65cebfcd151d109d6a
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including one pointing to a known malicious redirector at 'https://ttraff.com/pify?keyword=grace+kelly+mika+sheet+music'. The document body, though heavily obfuscated, also contains this URL and other links to Shopify-hosted PDFs, suggesting a link farm or redirection tactic. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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/pify?keyword=grace+kelly+mika+sheet+music
    • http://files.lanabiba.com/uploads/1/3/0/9/130969855/d04508c32a0b7.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/27482348981.pdf
    • https://cdn.shopify.com/s/files/1/0431/3664/7317/files/1788520541.pdf
    • https://cdn.shopify.com/s/files/1/0429/4259/5239/files/evowars._io_mod_level.pdf
    • https://cdn.shopify.com/s/files/1/0429/8362/0757/files/59654619637.pdf
    • https://cdn.shopify.com/s/files/1/0447/9025/1681/files/75823082868.pdf
    • https://cdn.shopify.com/s/files/1/0436/9947/0486/files/44797340525.pdf
    • https://cdn.shopify.com/s/files/1/0429/5675/1002/files/riramoka.pdf
    • https://cdn.shopify.com/s/files/1/0427/5824/2470/files/xowimenudawebederipuvitig.pdf
    • https://cdn.shopify.com/s/files/1/0431/6617/1296/files/nofurolulilixo.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_off00004ca6.bin
4a9c5b7bd648fbbed1c1b25734b185a66dc13433fbe2c98762a807b90b1b9d16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CA6 5236 bytes
font_01_sfnt_off00005e5d.bin
423be54d8df2ad290c35ceebd4a7a0f96751b50ac4971841a2e4e22875646921		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E5D 10060 bytes

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