Malicious PDF — malware analysis report

Static analysis result for SHA-256 d445f6720f3de3e4…

MALICIOUS

PDF

54.8 KB Created: 2020-08-31 17:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a8fdee5b3fa2f6b955b204445aa32e8 SHA-1: 22a0336e9444a2c71432672dcf5f958ccbb8fb2a SHA-256: d445f6720f3de3e40a0feb5f5ee5c4383734b1ad9617e33a857aff8f43227f9a
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains embedded links, one of which, https://ttraff.ru/wix?keyword=inequality+signs+worksheet, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Inequality signs worksheet' and the malicious URL, suggesting a lure to a malicious site. The ML classifier strongly supports the malicious verdict.

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=inequality+signs+worksheet
    • https://static.usrfiles.com/ugd/58a813_d3ef63206218405faba5049e7ab9d66e.pdf
    • https://static.usrfiles.com/ugd/5438e3_9b7a003b79734b6883d1208181344a89.pdf
    • https://static.usrfiles.com/ugd/fb5067_f18e4e45d60f4c8a94d9ed053fb62370.pdf
    • https://cdn.shopify.com/s/files/1/0432/8374/2884/files/biology_of_belief_book.pdf
    • https://cdn.shopify.com/s/files/1/0452/3101/4045/files/17670698550.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/judixukevofigux.pdf
    • https://cdn.shopify.com/s/files/1/0450/7333/4424/files/bioplastic_from_banana_peel_research_paper.pdf
    • https://cdn.shopify.com/s/files/1/0435/5093/3156/files/bododo.pdf
    • https://cdn.shopify.com/s/files/1/0428/1496/3868/files/7070515746.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/tanurufok.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_off0000895e.bin
d4fa58eb9aefddece9943ebdfbd530c538467149321c988163f95c6408dd0f1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x895E 5148 bytes
font_01_sfnt_off00009ae7.bin
50ad881727ca01436749ba4a55c9177e90ad8b925948d7e79d49fdeff383fff1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AE7 11528 bytes
font_02_sfnt_off0000c0ae.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0AE 4324 bytes

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