Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b331d4cb68154e1…

MALICIOUS

PDF

42.3 KB Created: 2020-08-03 15:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db586f8db1ea6a328cbc48b10454d13b SHA-1: 50b6845c86147c6a06bcb56b7bf97b956bc3a346 SHA-256: 5b331d4cb68154e194e28de0bd70c665a2fb0c8b1a654ea4f0840c1bca305e27
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on Shopify and other domains. The primary malicious link, 'https://ttraff.ru/pify?keyword=libro+rojo+de+auditoria+interna+pdf', is identified as a malicious redirector. This suggests the document is part of a link farm or SEO manipulation scheme, potentially used to distribute malware or phish for information.

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=libro+rojo+de+auditoria+interna+pdf
    • http://files.bridgeofmusic.org/uploads/1/3/0/7/130775306/liduji.pdf
    • http://files.gennylispadilla.com/uploads/1/3/2/6/132681812/1cf66.pdf
    • http://files.okotokshcpharmacy.com/uploads/1/3/1/4/131437848/devop.pdf
    • http://files.intothewildinc.org/uploads/1/3/0/7/130738919/rumubarove_fukositokelomod_xasiluzepafag.pdf
    • http://files.ikonartworks.com/uploads/1/3/0/8/130813966/neganazukuku_watatibojitez_turelaloz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/3277/1734/files/99295076790.pdf
    • https://cdn.shopify.com/s/files/1/0433/6438/4927/files/zopinave.pdf
    • https://cdn.shopify.com/s/files/1/0432/1227/5876/files/dovipesidonidezigiwozozu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7096/3350/files/70584260360.pdf
    • https://cdn.shopify.com/s/files/1/0428/7243/8947/files/sakopufozureraweg.pdf
    • https://cdn.shopify.com/s/files/1/0432/4704/2715/files/vusafomiti.pdf
    • https://cdn.shopify.com/s/files/1/0434/1583/0695/files/pijularezeni.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/12509012650.pdf
    • https://cdn.shopify.com/s/files/1/0432/4704/2715/files/25278925985.pdf
    • https://cdn.shopify.com/s/files/1/0432/8954/2809/files/six_pack_shortcut_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/57189589950.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006588.bin
e277cb9a4a82b9db9b4b29111cc2ca7020c13bcab3259d433795d57d7df19760		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6588 4980 bytes
font_01_sfnt_off0000768b.bin
5d34910b7184a6a4021289644a9d5c13fa58b2792e37b3e9a6448e7151eccf74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x768B 11200 bytes

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