Malicious PDF — malware analysis report

Static analysis result for SHA-256 636f7aa07c0f98c7…

MALICIOUS

PDF

39.8 KB Created: 2020-08-27 22:27:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9e490c8046cd1171caa88a4dd662c4d SHA-1: 131c24180541936b77f661a0ea5861fda90c5194 SHA-256: 636f7aa07c0f98c788c2a9bbd8b9c27654139aa4c2872f3e9b5eac069c83eaba
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.ru'. The document body, though heavily obfuscated, also contains this URL and numerous other links, many pointing to Shopify domains which are often abused for hosting malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=pharmacology+made+ridiculously+simple+pdf
    • http://sopipuwep.aedl2012.com/uploads/1/3/1/4/131483453/buroj.pdf
    • http://nefezam.alliedonesolutions.com/uploads/1/3/2/7/132710714/novekexusapajup.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3032/3101/files/graphic_design_leaflet_templates.pdf
    • https://cdn.shopify.com/s/files/1/0437/9380/9557/files/stet_bihar_previous_year_question_paper.pdf
    • https://cdn.shopify.com/s/files/1/0431/7026/7300/files/10210484229.pdf
    • https://cdn.shopify.com/s/files/1/0433/2758/6472/files/rukapunajezujikevelibir.pdf
    • https://cdn.shopify.com/s/files/1/0433/4754/2175/files/wofamon.pdf
    • https://cdn.shopify.com/s/files/1/0429/2942/2499/files/pitomurujosulusubine.pdf
    • https://cdn.shopify.com/s/files/1/0445/5694/3524/files/68941983974.pdf
    • https://cdn.shopify.com/s/files/1/0431/7465/8216/files/92224860980.pdf
    • https://cdn.shopify.com/s/files/1/0435/1836/1755/files/becoming_cht_michelle.pdf
    • https://cdn.shopify.com/s/files/1/0435/2924/0727/files/46549268187.pdf
    • https://cdn.shopify.com/s/files/1/0429/2712/8735/files/63221303755.pdf
    • https://cdn.shopify.com/s/files/1/0431/8311/2341/files/conundrum_red_blend_tech_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0439/1452/6872/files/5288407146.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_off00005c92.bin
324ec0531a196b23b858a675c64f105969ee9e9f62ef5d7c05b20c2215a44539		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C92 5672 bytes
font_01_sfnt_off00006fb8.bin
6e58a7f5448839ab09483ad22c7c2b8bd14c11bed9ee44c9bcf0f3d75ed0ee86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FB8 10272 bytes

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