Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd5b0d0b032a423…

MALICIOUS

PDF

41.9 KB Created: 2020-09-01 17:41:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c324249ceeff29fcf075a76282c0a99f SHA-1: cb6a872eee4eb6455a2b553210a34b70fb12ab7e SHA-256: 4dd5b0d0b032a423cd7b2bb599ec1265dd47f686af7980ed2ea81fcf282e76ab
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The presence of numerous links, many pointing to Shopify-hosted PDFs, suggests a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. No scripts were extracted, limiting the analysis of direct payload delivery.

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/wix?keyword=nightcore+the+spectre+remix
    • https://cdn.shopify.com/s/files/1/0432/5274/4356/files/balancing_chemical_equations_pogil.pdf
    • https://cdn.shopify.com/s/files/1/0434/7346/9597/files/vobikijopelokuwewazopodeb.pdf
    • https://cdn.shopify.com/s/files/1/0430/9850/5369/files/captivating_journal.pdf
    • https://cdn.shopify.com/s/files/1/0431/5732/3933/files/80567722803.pdf
    • https://cdn.shopify.com/s/files/1/0427/4785/5004/files/windows_registry.pdf
    • https://cdn.shopify.com/s/files/1/0427/7898/4614/files/87203991997.pdf
    • https://static.usrfiles.com/ugd/b8c837_a36ea42998094656aa0a9fa596767647.pdf
    • https://static.usrfiles.com/ugd/b8c837_180bab1df0fc4d8e9ea8f9ab08d461e7.pdf
    • https://static.usrfiles.com/ugd/b8c837_591654e411f94a9eab90d94087a75b17.pdf
    • https://static.usrfiles.com/ugd/5af86b_664744c9d0fe4a24a6921394ead5fb57.pdf
    • https://cdn.shopify.com/s/files/1/0431/9323/7665/files/94777549004.pdf
    • https://cdn.shopify.com/s/files/1/0461/1997/7124/files/sheet_piles_wall.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_off00004880.bin
9dd02f6eb957378b7afa8474b4a16306c42e433416e26dc9e8d102b2a46f3d03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4880 5144 bytes
font_01_sfnt_off000059eb.bin
078025b853f774ea55a71d0d86417c153de4d8457f74e4be75e75057ec538683		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59EB 9744 bytes
font_02_sfnt_off00007b61.bin
f5a048b1ab14c4ed100c33e180fc17db97981efc468eb1f4521bfc92f31b8f18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B61 18844 bytes

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