Malicious PDF — malware analysis report

Static analysis result for SHA-256 de86df3dad66307c…

MALICIOUS

PDF

49.9 KB Created: 2020-08-23 11:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc4a8b1a386ff72eec8726f5c45bbe03 SHA-1: 3de5ef2ea47ce341f51e2848571f97647bb43847 SHA-256: de86df3dad66307c285552f80458a5287c426a4b77636f3f79d1e7b9ff789c8e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.ru'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier strongly indicates maliciousness. The primary attack pattern involves luring users to a malicious site disguised as a resource for design guidelines.

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=material+design+guidelines+dropdown
    • http://files.admarc.com/uploads/1/3/0/7/130775795/gatumaduvuweli-setivas.pdf
    • http://files.nanolab.info/uploads/1/3/1/3/131379749/befuraxigufero.pdf
    • http://files.admarc.com/uploads/1/3/0/7/130775795/gatumaduvuweli-s
    • https://cdn.shopify.com/s/files/1/0432/1050/6404/files/36160588712.pdf
    • https://cdn.shopify.com/s/files/1/0439/3461/3659/files/sutovukodiwukidid.pdf
    • https://cdn.shopify.com/s/files/1/0428/4248/8998/files/dufoverariruxi.pdf
    • https://cdn.shopify.com/s/files/1/0458/0956/5862/files/31241971402.pdf
    • https://cdn.shopify.com/s/files/1/0428/4035/9068/files/vodimidimisemobi.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2691/files/24147389657.pdf
    • https://cdn.shopify.com/s/files/1/0432/2436/7262/files/bagunokexixuvunafiminoket.pdf
    • https://cdn.shopify.com/s/files/1/0427/8275/2935/files/here_i_am_to_worship_chords_g.pdf
    • https://cdn.shopify.com/s/files/1/0431/3461/5706/files/mimexibefemujuxetusofag.pdf
    • https://cdn.shopify.com/s/files/1/0431/7659/1509/files/cute_calendar_2020_printable.pdf
    • https://cdn.shopify.com/s/files/1/0433/6130/4744/files/dell_latitude_7290_laptop_datasheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/6978/3720/files/65354876503.pdf
    • https://cdn.shopify.com/s/files/1/0435/2576/7327/files/59709825316.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ce6.bin
fb7fc86673b608e5164ce0663cec903752f7700c8a75101c969aaa4eaf2638ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CE6 5224 bytes
font_01_sfnt_off00007ec6.bin
8db4959e688e52657de8e3e2dfee699a82222961def3dc97838d11aeec7c32a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EC6 2896 bytes
font_02_sfnt_off00008acf.bin
e61d3e48ab5ef5f0f223b47700058f0d088902248bedefce01bd5915035cdc6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8ACF 14924 bytes

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