Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdd5f43a0daa5fe8…

MALICIOUS

PDF

40.6 KB Created: 2020-08-07 08:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c36c4fbc1a082c4e87b01c63112f7a47 SHA-1: 9b83700dfd81ccb85d36f8e5d1ed1a0d1290ebaf SHA-256: cdd5f43a0daa5fe812947b3634cfffdacc6f69a98b74d2d1b69f11172108a0f3
150 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many of which point to external resources. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely intended to lead the user to a malicious site. The document body, though heavily obfuscated, contains text suggesting it is an 'adverbs of time worksheets pdf', a common lure for educational content. The presence of multiple shopify.com links and other file-hosting domains suggests a link farm designed to obscure the malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.cc/pify?keyword=adverbs+of+time+worksheets+pdf
    • http://files.knoxchurchperth.com/uploads/1/3/1/6/131637016/pevovu-kotow.pdf
    • http://files.explorestanton.com/uploads/1/3/1/4/131453216/6741733.pdf
    • http://files.elcequestrian.com/uploads/1/3/1/4/131407036/0727d3d4b.pdf
    • https://cdn.shopify.com/s/files/1/0434/8005/5958/files/building_materials_and_construction_practices.pdf
    • https://cdn.shopify.com/s/files/1/0439/4477/1739/files/practical_skills_in_chemistry.pdf
    • https://cdn.shopify.com/s/files/1/0437/2067/1386/files/4338914367.pdf
    • https://cdn.shopify.com/s/files/1/0435/0767/9397/files/zamudewalufir.pdf
    • https://cdn.shopify.com/s/files/1/0432/8026/9477/files/31748859894.pdf
    • https://cdn.shopify.com/s/files/1/0436/5287/4390/files/42653554626.pdf
    • https://cdn.shopify.com/s/files/1/0430/2487/5674/files/algorithms_in_c_part_5_graph_algorithms_3rd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0427/5725/9420/files/potimizamobibev.pdf
    • https://cdn.shopify.com/s/files/1/0431/7508/4193/files/jubumapimikizujefur.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_off00005fd0.bin
1a34bce59ea609f026819dc74cf797a2525b02233e5c6f837320e3db49ec288d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FD0 5384 bytes
font_01_sfnt_off0000720b.bin
fdb3d042178013e0faf199f257b3f6adec9e61017e615af857a68ac8b4bab919		 pdf-font-stream PDF embedded font (sfnt) at offset 0x720B 10412 bytes

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