Malicious PDF — malware analysis report

Static analysis result for SHA-256 f67ad3eda8df7e46…

MALICIOUS

PDF

39.5 KB Created: 2020-08-28 21:36:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba6ea9f1bca53cb17a2a33c052493a3f SHA-1: a03973e41b5de4d3f95a945410df1ea2a80a4404 SHA-256: f67ad3eda8df7e4689a6d168c9374d33fc498a9f9b6d57c98bbe421ad21c8ebb
150 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it's a redirector link to known malicious infrastructure. Additionally, another critical heuristic identified a PDF link farm with numerous external links, many hosted on Shopify. The primary malicious URL, https://ttraff.ru/wix?keyword=nature+ralph+waldo+emerson+soapstone, is likely used to lure victims. The document body contains garbled text but does include the malicious URL and several benign-looking PDF links, suggesting an attempt to disguise malicious intent.

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=nature+ralph+waldo+emerson+soapstone
    • https://static.usrfiles.com/ugd/b8c837_89ba8acef18a416eab540a220f16fe61.pdf
    • https://static.usrfiles.com/ugd/b8c837_d8405a7a87514521a8b6e3a1fa891439.pdf
    • https://static.usrfiles.com/ugd/b8c837_96711c4ee1d3412d9f57b6d255b93abe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dewubi.pdf
    • https://cdn.shopify.com/s/files/1/0434/6282/0005/files/mofurenulibojovo.pdf
    • https://cdn.shopify.com/s/files/1/0429/6065/0393/files/59373278476.pdf
    • https://cdn.shopify.com/s/files/1/0433/7496/8986/files/rarevalezufuguwizemaza.pdf
    • https://cdn.shopify.com/s/files/1/0465/8141/6103/files/ets2_mods_tuning.pdf
    • https://cdn.shopify.com/s/files/1/0430/4830/4797/files/70005428651.pdf
    • https://cdn.shopify.com/s/files/1/0434/3778/5240/files/vemokopigozerawiwu.pdf
    • https://cdn.shopify.com/s/files/1/0427/4572/5094/files/aqualung_dive_computer_i550_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/6540/1753/files/49250299027.pdf
    • https://cdn.shopify.com/s/files/1/0432/8036/7780/files/vubaranojade.pdf
    • https://cdn.shopify.com/s/files/1/0431/0515/7282/files/kuzap.pdf
    • https://cdn.shopify.com/s/files/1/0434/0639/3496/files/fijeluxugo.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_off00005d70.bin
58f99f9e81b175a1a973741d23c2a1820bc745b7a7ecfff29cb6c20fa03cf583		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D70 5260 bytes
font_01_sfnt_off00006f3e.bin
a2e37f8f5b9ad704e65e684cbc4ebedb35b35e5fa19320cd0f6c985b00877f16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F3E 9988 bytes

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