Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a6be50ed09b3381…

MALICIOUS

PDF

45.6 KB Created: 2020-08-18 14:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03879d9fc6cc3382b630670a35770f9a SHA-1: 670ef20f24d21d8a629f83d1af6bc2b29ccd929b SHA-256: 3a6be50ed09b3381bf450610a9b66178807623e3b75a94dd1b9da8391f22acc4
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, many of which point to SEO-optimized PDF files hosted on Shopify. One of these links, 'https://ttraff.ru/pify?keyword=n.+c.+e.+t+full+form', is flagged as a malicious redirector. This suggests a campaign to lure users through search engine results to malicious content. The ML classifier also strongly indicated 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=n.+c.+e.+t+full+form
    • http://files.elcequestrian.com/uploads/1/3/1/4/131407036/0727d3d4b.pdf
    • https://cdn.shopify.com/s/files/1/0435/1311/8872/files/climax_portable_machine_tools.pdf
    • https://cdn.shopify.com/s/files/1/0433/3033/8966/files/chinese_remainder_theorem_python.pdf
    • https://cdn.shopify.com/s/files/1/0436/1525/6738/files/brightstar_device_protection_claim_form.pdf
    • https://cdn.shopify.com/s/files/1/0434/0842/5116/files/folopabolono.pdf
    • https://cdn.shopify.com/s/files/1/0427/8861/8396/files/bldc_full_form.pdf
    • https://cdn.shopify.com/s/files/1/0434/9673/4880/files/26778154479.pdf
    • https://cdn.shopify.com/s/files/1/0432/3452/5352/files/47563170741.pdf
    • https://cdn.shopify.com/s/files/1/0434/6049/3474/files/66987250791.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_off0000614a.bin
5d66a552e25ac2f79560c95fe6a5540646a6fa7cb71da1b99d85de7850803fe4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x614A 4640 bytes
font_01_sfnt_off000070fe.bin
f9f8e0530155ef02bf2c495aee35b7031743064309387dc55f15e49ede1f9a26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70FE 10376 bytes
font_02_sfnt_off000094ba.bin
541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94BA 16204 bytes

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