Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f9be3d297cfb751…

MALICIOUS

PDF

43.1 KB Created: 2020-07-31 23:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0ce5dbc81e4ab76074b9cb1fa17a22d SHA-1: 3d68393a0a05a6c7f10447996f607c567b8da1ec SHA-256: 9f9be3d297cfb75120e6940fb814f032aad4adf7fc50260faf1e240882635a43
150 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one specifically pointing to a known malicious redirector. The heuristic firings indicate a PDF malicious redirector link and a PDF SEO link farm, suggesting the document's primary purpose is to lure users to malicious sites. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the extensive link farm points to a delivery mechanism for further malicious activity.

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.com/pify?keyword=latex+for+mac
    • http://files.davidzapparoliphotography.com/uploads/1/3/0/7/130774990/1562298.pdf
    • http://files.countrygiftandthrift.com/uploads/1/3/0/8/130813364/xevobaxikufa.pdf
    • http://files.kinellarhall.com/uploads/1/3/1/3/131379246/zujevorepolubepek.pdf
    • http://files.kristielance.com/uploads/1/3/1/4/131438499/3105954.pdf
    • https://cdn.shopify.com/s/files/1/0439/0384/4520/files/65656425280.pdf
    • https://cdn.shopify.com/s/files/1/0435/1698/5508/files/90485196944.pdf
    • https://cdn.shopify.com/s/files/1/0431/0456/7450/files/waxoxax.pdf
    • https://cdn.shopify.com/s/files/1/0427/8131/1132/files/78009792951.pdf
    • https://cdn.shopify.com/s/files/1/0430/9726/0192/files/puzodoludexavalo.pdf
    • https://cdn.shopify.com/s/files/1/0432/7754/9726/files/56979107669.pdf
    • https://cdn.shopify.com/s/files/1/0428/4055/5676/files/32127989638.pdf
    • https://cdn.shopify.com/s/files/1/0437/9541/5189/files/80051669151.pdf
    • https://cdn.shopify.com/s/files/1/0436/2846/2240/files/40232957982.pdf
    • https://cdn.shopify.com/s/files/1/0429/7405/2503/files/tipotepamivususi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6335/3244/files/3392573272.pdf
    • https://cdn.shopify.com/s/files/1/0428/0333/1231/files/gavijulebikofafolixav.pdf
    • https://cdn.shopify.com/s/files/1/0436/9969/9866/files/dibujefufuf.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_off00006d5e.bin
fc81ef86deb2976b549f145eb29bae1de66731b2193827a4845b6d492fd942fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D5E 4828 bytes
font_01_sfnt_off00007dc3.bin
e345a3b399907e1041f588e426020abac336b5f7e2d193cd51da5618ab54b000		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DC3 10024 bytes

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