Malicious PDF — malware analysis report

Static analysis result for SHA-256 4446aedd0ad4ade7…

MALICIOUS

PDF

43.5 KB Created: 2020-08-22 05:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3cbc689a4ec7e59f9fcd4e9e52d71a0 SHA-1: ec4edc678953edefd601cf3e7067995f94e7ed2c SHA-256: 4446aedd0ad4ade7f3d3c42b4d09a4665b48a883e1a5fe0258d97a4bb4b949ed
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which is also present in the document body. The link leads to a URL that appears to be a search result for 'assassin's creed syndicate size pc', suggesting a lure to trick users into clicking. The PDF also contains a large number of external links, many pointing to Shopify, which is flagged as a link farm. The ML classifier strongly indicates maliciousness.

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.ru/pify?keyword=assassin%2527+s+creed+syndicate++size+pc
    • http://vezim.jngibson.com/uploads/1/3/0/7/130774965/4ac1bc5bab.pdf
    • http://files.breatheyogapilates.ie/uploads/1/3/0/7/130740571/459f22c6f0fb8b.pdf
    • http://files.kyincofchrist.com/uploads/1/3/0/7/130740049/rorumavuwe.pdf
    • https://cdn.shopify.com/s/files/1/0438/1586/2434/files/support_vector_machine_theory.pdf
    • https://cdn.shopify.com/s/files/1/0433/3545/0774/files/free_car_maintenance_manuals.pdf
    • https://cdn.shopify.com/s/files/1/0427/7354/5116/files/17094718981.pdf
    • https://cdn.shopify.com/s/files/1/0440/6686/5302/files/kupetozuzevewunide.pdf
    • https://cdn.shopify.com/s/files/1/0438/3762/0386/files/97759364745.pdf
    • https://cdn.shopify.com/s/files/1/0436/4474/7929/files/samojexad.pdf
    • https://cdn.shopify.com/s/files/1/0429/6110/9155/files/nugiwuguvekolaze.pdf
    • https://cdn.shopify.com/s/files/1/0434/5731/4983/files/brassica_rapa_fast_plants_information.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_off00005df2.bin
4f6a1c79beff23bfb6fb0cbca0dae97ec5fab36a3cc29ce343c3ce58957594e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DF2 4888 bytes
font_01_sfnt_off00006ea5.bin
1165247daff33d824ef9ef71c86a91a6e63313b052222c6af79d7952497a0701		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EA5 10716 bytes
font_02_sfnt_off00009338.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9338 4324 bytes

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