Malicious PDF — malware analysis report

Static analysis result for SHA-256 d09f68645d95cde8…

MALICIOUS

PDF

42.1 KB Created: 2020-08-07 07:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e14a077ab6bef4bcbf328cae55aa78e5 SHA-1: 8a0d7e51ed613f12b63fe2c872fc84ff50ba57c4 SHA-256: d09f68645d95cde85a453eb83421c8443e5a5967ec247b0309f6cfef315bf7f5
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, including a known malicious redirector at 'ttraff.ru'. This indicates a link farm or redirection strategy designed to lead users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the heuristic findings of a malicious redirector and a link farm. No scripts were extracted, but the primary attack pattern involves directing users to external resources.

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=cgp+an+inspector+calls+pdf
    • http://files.lemonaidfund.org/uploads/1/3/1/4/131454850/8933040.pdf
    • http://files.happybuddha-aruba.com/uploads/1/3/1/4/131410952/9132913.pdf
    • http://files.tsutsumiteapots.com/uploads/1/3/0/8/130874058/tuvumapofisoju.pdf
    • http://guxokopo.agentfortruth.com/uploads/1/3/2/7/132740405/5075215.pdf
    • http://files.westaucklandcadets.com/uploads/1/3/0/7/130775992/5356230.pdf
    • https://cdn.shopify.com/s/files/1/0437/5475/0106/files/jajan.pdf
    • https://cdn.shopify.com/s/files/1/0431/9110/7752/files/gumojukotimuri.pdf
    • https://cdn.shopify.com/s/files/1/0434/1583/0695/files/tawulas.pdf
    • https://cdn.shopify.com/s/files/1/0430/3477/1610/files/bewurij.pdf
    • https://cdn.shopify.com/s/files/1/0434/0930/9848/files/97597808433.pdf
    • https://cdn.shopify.com/s/files/1/0428/0310/1863/files/nepube.pdf
    • https://cdn.shopify.com/s/files/1/0431/0204/4316/files/vuluzajoxawulesutugeg.pdf
    • https://cdn.shopify.com/s/files/1/0432/0018/4477/files/71355277546.pdf
    • https://cdn.shopify.com/s/files/1/0431/7826/2689/files/78535012612.pdf
    • https://cdn.shopify.com/s/files/1/0433/5783/1336/files/common_interview_questions_and_answers_for_managers.pdf
    • https://cdn.shopify.com/s/files/1/0433/8103/1064/files/71353689406.pdf
    • https://cdn.shopify.com/s/files/1/0432/4543/7083/files/carbohydrates_importance.pdf
    • https://cdn.shopify.com/s/files/1/0439/3716/9576/files/82928432905.pdf
    • https://cdn.shopify.com/s/files/1/0434/5407/0951/files/69644926413.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/hms_housing_uf.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_off0000564d.bin
5f275efc31192764735b37865f5702bd01b53e693444a69d6963bfc111da59b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x564D 5132 bytes
font_01_sfnt_off000067c8.bin
f6ccd975274296046f08da96489d210d578a191d4414a3e84f4093d4e29393b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67C8 10680 bytes
font_02_sfnt_off00008bae.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BAE 4324 bytes

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