Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c6eab23db0388bd…

MALICIOUS

PDF

51.6 KB Created: 2020-08-23 23:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ba5ec62d2bd048ad31f8c89a02c88ed SHA-1: e049556de03d166297b4d4327eaa5c039d5c6a60 SHA-256: 8c6eab23db0388bd120d07019e64ae469d9a6ed93622af5a8d58b48a50f4cceb
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external resources. The primary malicious URL identified is https://ttraff.ru/pify?keyword=breezesys+er+pro, which likely serves as a gateway to further malicious content or phishing pages.

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=breezesys+er+pro
    • http://sokoz.mbepto.com/uploads/1/3/0/7/130775795/namedejal.pdf
    • https://cdn.shopify.com/s/files/1/0434/2343/2854/files/lozuvuniwewabajevatefefu.pdf
    • https://cdn.shopify.com/s/files/1/0433/8168/6439/files/59209220588.pdf
    • https://cdn.shopify.com/s/files/1/0433/2018/0894/files/merumogume.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wajumibuxup.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dewubi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3305/0779/files/xutefitefulixulox.pdf
    • https://cdn.shopify.com/s/files/1/0429/4321/7830/files/zusipilila.pdf
    • https://cdn.shopify.com/s/files/1/0439/3605/5454/files/ccda_exam_questions.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008d0b.bin
edaed516b0696ae2bc1d575e89f3f1e586209accd67ec4711a6ef1744b1acc0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D0B 4772 bytes
font_01_sfnt_off00009d6b.bin
b59c8c0c752f9c3b71d8b4a4169849fae96d41d1ad39bfc89dddb20dd42ffe24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D6B 10900 bytes

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