Malicious PDF — malware analysis report

Static analysis result for SHA-256 23267d997c5b29a6…

MALICIOUS

PDF

40.8 KB Created: 2020-08-10 23:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: befc97182c249d540284b47077ba1bb9 SHA-1: cdf3dd714abda2009d4a3d878dc552b8a735a8e0 SHA-256: 23267d997c5b29a61a3588d46813c7610d8d2faf55cb5693079dcbea4e484daa
150 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting an attempt to manipulate search engine results or distribute spam. The ML classifier strongly supports the malicious nature of this document.

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=cisco+lab+book+pdf
    • http://files.theunfinishedsoul.com/uploads/1/3/2/7/132712088/daxibefonifin.pdf
    • http://files.adventurehorizons.com/uploads/1/3/1/3/131383373/f28dfc0052eb5a.pdf
    • http://benasow.chancellors.org/uploads/1/3/1/0/131070674/xotelagunonela-kelanobozowe-kovulu.pdf
    • http://files.colorreadings.com/uploads/1/3/2/6/132682862/9ff7d.pdf
    • http://files.thompsonphoto.co.uk/uploads/1/3/0/8/130814329/9681255.pdf
    • https://cdn.shopify.com/s/files/1/0435/3599/0936/files/genestealer_cult_codex_7th.pdf
    • https://cdn.shopify.com/s/files/1/0433/8289/8840/files/muwadubofivaku.pdf
    • https://cdn.shopify.com/s/files/1/0435/8835/4207/files/breeds_of_goat_in_nigeria.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kosetomamevisired.pdf
    • https://cdn.shopify.com/s/files/1/0433/9515/4070/files/xuvarotagigerobosavuzuxo.pdf
    • https://cdn.shopify.com/s/files/1/0428/0313/4627/files/xevugodidukilupele.pdf
    • https://cdn.shopify.com/s/files/1/0429/7788/6367/files/41590185913.pdf
    • https://cdn.shopify.com/s/files/1/0428/2174/6847/files/20584411917.pdf
    • https://cdn.shopify.com/s/files/1/0429/4026/8711/files/zefatebo.pdf
    • https://cdn.shopify.com/s/files/1/0435/0086/3643/files/powejemepejonowojuno.pdf
    • https://cdn.shopify.com/s/files/1/0431/3874/4476/files/nisexivalozuvuzake.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/96230534422.pdf
    • https://cdn.shopify.com/s/files/1/0429/8362/0767/files/8977949217.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_off00006303.bin
3b0414b2df0ab79148d17e326520c175264573bd61479bc81fb321e3e93c84bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6303 5164 bytes
font_01_sfnt_off00007499.bin
4cee1b2cd3a732ab231a052b63c38078afdaa7b3a68dcbdec337b1e1cc7176d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7499 9844 bytes

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