Malicious PDF — malware analysis report

Static analysis result for SHA-256 7af87c308010fb4f…

MALICIOUS

PDF

44.5 KB Created: 2020-08-04 06:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34a262db740857ced8d9485ca0f146a1 SHA-1: 3f08315f10fc6e7ba81eab433d02b47a8e80deea SHA-256: 7af87c308010fb4f33d0df5bc554fe0b93312d5409112d8b5e5b7a4e7184932d
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.ru/wb?keyword=foundations%20of%20financial%20markets%20and%20institutions%20pdf%20download%20free'. The document body, though partially corrupted, also contains this URL and other links to Shopify domains, suggesting a link farm designed to lure users into downloading files. The ML classifier strongly supports the malicious nature of this PDF.

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/wb?keyword=foundations%20of%20financial%20markets%20and%20institutions%20pdf%20download%20free
    • http://risix.matsumastergardeners.com/uploads/1/3/0/8/130873876/vofowudazeter_bururanamez.pdf
    • http://files.kellygallagheririshdance.com/uploads/1/3/0/7/130740462/tikenunotifimo.pdf
    • http://files.animspree.com/uploads/1/3/1/6/131606174/nafajiwisafapa_fofifalozodinu.pdf
    • http://files.empowerptandwellness.com/uploads/1/3/0/8/130874169/nuvin_bakobalowelex.pdf
    • http://files.ethelbustamante.net/uploads/1/3/1/4/131406356/7012749.pdf
    • https://cdn.shopify.com/s/files/1/0432/7958/1352/files/vosunakovubuxuruzibowukez.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/ferexofuxujijisefiludoto.pdf
    • https://cdn.shopify.com/s/files/1/0430/5806/9655/files/49029309342.pdf
    • https://cdn.shopify.com/s/files/1/0435/0381/2773/files/50492775212.pdf
    • https://cdn.shopify.com/s/files/1/0431/3631/9639/files/98217401073.pdf
    • https://cdn.shopify.com/s/files/1/0431/5113/0785/files/11664016804.pdf
    • https://cdn.shopify.com/s/files/1/0432/0156/0737/files/78599753447.pdf
    • https://cdn.shopify.com/s/files/1/0431/0908/9447/files/vukagosubisibesebinu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5082/6905/files/49007954951.pdf
    • https://cdn.shopify.com/s/files/1/0437/1320/0282/files/letabumixopofuralusazafe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/9284441163.pdf?v=1594212706
    • https://cdn.shopify.com/s/files/1/0439/3969/2699/files/zavevazadorejonab.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_off00006e05.bin
48fb71098c9449181a6d7cc8f02fcb58b26354214e3c1763652a5edd03968905		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E05 5412 bytes
font_01_sfnt_off00008071.bin
12bd2e9ecd06eed4e58ffe7b38c49e6c34a5723e9c02814e3746278e8eddfe6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8071 10568 bytes

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