Malicious PDF — malware analysis report

Static analysis result for SHA-256 0474c57bb218ee69…

MALICIOUS

PDF

46.9 KB Created: 2020-08-07 19:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb9d39517f799d780b6d762ec568d7be SHA-1: 827329b3276b3d180f3b9d2c8219f66fa6ca4e1e SHA-256: 0474c57bb218ee69aa4c8a161fd83cf6cac9a96d992ac98b6ddd5345f6b903e9
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 Shopify domains hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector, 'ttraff.cc', which is likely the primary malicious payload delivery mechanism. The ML classifier strongly supports the malicious nature of this PDF.

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=segmentos+de+la+arteria+carotida+interna+pdf
    • http://files.jasonsternfineart.com/uploads/1/3/1/3/131398497/jozewa.pdf
    • http://files.crossofchristpetoskey.com/uploads/1/3/1/3/131380029/cdf5f73596aff72.pdf
    • http://files.mmarshallchurch.com/uploads/1/3/1/3/131379894/zoberuverusoripameli.pdf
    • http://files.eloquentlearning.com/uploads/1/3/1/3/131379382/1920566.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/7313/2954/files/zozujexofo.pdf
    • https://cdn.shopify.com/s/files/1/0428/5703/7990/files/asme_journal_of_mechanical_design.pdf
    • https://cdn.shopify.com/s/files/1/0433/5537/3720/files/83980240182.pdf
    • https://cdn.shopify.com/s/files/1/0431/5650/4744/files/57395841248.pdf
    • https://cdn.shopify.com/s/files/1/0437/3607/2341/files/54869185027.pdf
    • https://cdn.shopify.com/s/files/1/0435/6371/2671/files/tamureva.pdf
    • https://cdn.shopify.com/s/files/1/0432/9422/8630/files/497691616.pdf
    • https://cdn.shopify.com/s/files/1/0431/5417/8216/files/110310656.pdf
    • https://cdn.shopify.com/s/files/1/0429/3974/4419/files/57890055265.pdf
    • https://cdn.shopify.com/s/files/1/0431/6076/4576/files/tanugosupevawenonevaf.pdf
    • https://cdn.shopify.com/s/files/1/0432/4684/6107/files/81711079658.pdf
    • https://cdn.shopify.com/s/files/1/0429/9869/4049/files/18393477112.pdf
    • https://cdn.shopify.com/s/files/1/0438/4551/7469/files/sexowofutobumuk.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_off00007290.bin
2790eeb38a9ca50c1e09de2bd32739146b3a5e2d5d2e88413d9bcf25fa4b12c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7290 5580 bytes
font_01_sfnt_off00008578.bin
d15489c3cd44569efb4436493d45e1bbccae828f1b4e2bb1619b61588fbe7e21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8578 12400 bytes

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