Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b2af5f9ac1a7141…

MALICIOUS

PDF

46.2 KB Created: 2020-08-11 08:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: acf704c2a07f4ac7b1fb8d0ddbc3e948 SHA-1: 7899b52af30a296aa9efef9fa4b6166ab5dd22d9 SHA-256: 0b2af5f9ac1a7141eda44ebac820ce388ca2f9aeb38f365d7d54592f92a9b7ce
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on Shopify and other domains, suggesting a link farm or SEO poisoning attempt. One prominent link, 'https://ttraff.cc/pify?keyword=building+maintenance+engineer+job+description+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other Shopify links, reinforcing the lure of a job description to encourage clicks. The ML classifier also 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.cc/pify?keyword=building+maintenance+engineer+job+description+pdf
    • http://vagima.qstreetband.com/uploads/1/3/1/3/131380005/tanewewus_koxakebipedir_ritumoguzi.pdf
    • http://files.lofgrenmusicstudio.com/uploads/1/3/1/3/131381901/1feb041.pdf
    • http://files.theshookcompany.com/uploads/1/3/1/3/131383398/5620325.pdf
    • http://files.thiarablueberryfarms.com/uploads/1/3/0/7/130739470/fe34c3ea33cb271.pdf
    • http://files.olivareslock.com/uploads/1/3/1/4/131453329/pamajekavifevep.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/1102/9666/files/51417166708.pdf
    • https://cdn.shopify.com/s/files/1/0431/9998/7873/files/90894134995.pdf
    • https://cdn.shopify.com/s/files/1/0436/8603/5621/files/losojavafif.pdf
    • https://cdn.shopify.com/s/files/1/0437/1903/2984/files/66734267391.pdf
    • https://cdn.shopify.com/s/files/1/0430/7730/4484/files/62788923321.pdf
    • https://cdn.shopify.com/s/files/1/0427/4677/3660/files/vonarekiniluxeb.pdf
    • https://cdn.shopify.com/s/files/1/0430/1455/3763/files/35235497445.pdf
    • https://cdn.shopify.com/s/files/1/0438/6599/7472/files/download_biochemistry_satyanarayana_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/1745/3211/files/jewadu.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/23859765904.pdf
    • https://cdn.shopify.com/s/files/1/0436/1050/5373/files/98715091304.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_off000072af.bin
576ca9c2c2c0b99eca883ed561aacd1c1a22d24368d87a697712bdb6c26e0c32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72AF 5740 bytes
font_01_sfnt_off00008616.bin
ca5ffb819e2786bf14abeb74a86b5e7c6680b2b51cb759c4fdf689900d528378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8616 10908 bytes

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