Malicious PDF — malware analysis report

Static analysis result for SHA-256 59aa4693aafe9e53…

MALICIOUS

PDF

44.3 KB Created: 2020-08-19 08:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d92a2183b4247287f31a972c3d48b6cf SHA-1: 60477018fab0e5bf8e96bb02ccf04044ab8cf46e SHA-256: 59aa4693aafe9e532236de485f042e28e51de13bd127266daf00bd36adf5b311
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one pointing to a known malicious redirector at 'https://ttraff.ru/pify?keyword=vpn+browser+pc+free'. The document body, though heavily obfuscated, also contains this URL, suggesting a lure for users seeking VPN software. The presence of numerous links, many hosted on Shopify, indicates a link farm designed to obscure the ultimate destination. The ML classifier strongly flagged this PDF as malicious.

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.ru/pify?keyword=vpn+browser+pc+free
    • http://files.blacksheepsalonfl.com/uploads/1/3/2/6/132695832/ac3ec8d70a.pdf
    • http://zutab.angevinempire.org/uploads/1/3/1/0/131070566/025bba.pdf
    • https://cdn.shopify.com/s/files/1/0431/1970/6269/files/sufezasijo.pdf
    • https://cdn.shopify.com/s/files/1/0435/1423/3000/files/oki_microline_320_turbo.pdf
    • https://cdn.shopify.com/s/files/1/0428/7922/1919/files/ridifafodupirexodazib.pdf
    • https://cdn.shopify.com/s/files/1/0440/8573/9670/files/85414643513.pdf
    • https://cdn.shopify.com/s/files/1/0429/8198/2361/files/92848493335.pdf
    • https://cdn.shopify.com/s/files/1/0431/8186/7176/files/46938731195.pdf
    • https://cdn.shopify.com/s/files/1/0433/8276/7779/files/rinakefow.pdf
    • https://cdn.shopify.com/s/files/1/0427/6187/9719/files/bojimani.pdf
    • https://cdn.shopify.com/s/files/1/0440/2629/8533/files/robaveximo.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_off00007215.bin
6aa3323449c0c98221678e0a15b835db0ecb0f7023ccd8fa2f2454ac3822e22e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7215 4964 bytes
font_01_sfnt_off00008318.bin
4d5833fe85f1362cc8dbdf2b1bcd6bb0cfafbfe364174e1b714659c27cb9dcde		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8318 10000 bytes

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