Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef9ad9cde425b8cd…

MALICIOUS

PDF

33.9 KB Created: 2020-08-19 09:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8aaed164fe7a08f41605dd1514d0f35 SHA-1: fbd5a594d9e4f771c1be7cc1fa98ca43f4b11d15 SHA-256: ef9ad9cde425b8cd25ce4789c777b31bd0d70cf0a42d13d5f60a2017bfd2ef98
152 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, with at least one pointing to a known malicious redirector at 'ttraff.ru'. This suggests a phishing or social engineering attack where the user is lured to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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=understanding+business+12th+pdf
    • http://fufon.colourwizards.com/uploads/1/3/1/4/131454046/gatozawovusola_sidale_riworele.pdf
    • https://cdn.shopify.com/s/files/1/0432/6722/7811/files/rasetazunejujedomuwa.pdf
    • https://cdn.shopify.com/s/files/1/0433/3410/7286/files/zulaxixamulixakel.pdf
    • https://cdn.shopify.com/s/files/1/0437/6395/7918/files/9_line_medevac_card.pdf
    • https://cdn.shopify.com/s/files/1/0432/9085/3531/files/92182413227.pdf
    • https://cdn.shopify.com/s/files/1/0445/4006/8004/files/vabamuw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xovigaza.pdf
    • https://cdn.shopify.com/s/files/1/0436/9206/4933/files/dekokeke.pdf
    • https://cdn.shopify.com/s/files/1/0436/0021/6232/files/metumolesexom.pdf
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/47887365552.pdf
    • https://cdn.shopify.com/s/files/1/0435/4369/1419/files/xivipilawanoxotij.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_off000046e7.bin
138edaa1041473c3839e635b9a10f8aaffc76bf9f7fe96bae044860c2a183271		 pdf-font-stream PDF embedded font (sfnt) at offset 0x46E7 5584 bytes
font_01_sfnt_off000059d7.bin
96bd7885e02a8d49f791e1f35e1898b2ca141d9f37be85c68292a125d4413b30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59D7 9852 bytes

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