Malicious PDF — malware analysis report

Static analysis result for SHA-256 e935001fe65668d8…

MALICIOUS

PDF

40.9 KB Created: 2020-08-23 08:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: add1f69b92da82b43a0ca16c37c21682 SHA-1: 733f4379f86dc4969d2916fa99aa1c75b2f18a61 SHA-256: e935001fe65668d8941462b645df06c65a5f492f2a58243ac8a79ad068679604
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a malicious redirector at 'https://ttraff.ru/pify?keyword=fraction+worksheets+for+7+year+olds'. The document body, though partially corrupted, also contains this URL and references 'fraction worksheets for 7 year olds', suggesting a lure for educational content. The ML classifier strongly indicates maliciousness. The presence of a link farm further supports a malicious intent, likely for phishing or malware delivery.

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=fraction+worksheets+for+7+year+olds
    • http://files.sonhslks.com/uploads/1/3/1/4/131406274/refafudutepe.pdf
    • http://lovefibo.overcomeporn.org/uploads/1/3/2/8/132816042/2d5139a29e4f02.pdf
    • http://files.bridgewaterseniorsquadron-civilairpatrol.org/uploads/1/3/0/9/130969791/952da3aadd7f734.pdf
    • http://dapemof.simplyglamorousdesigns.com/uploads/1/3/0/8/130813306/881b39afbcb558c.pdf
    • https://cdn.shopify.c
    • https://cdn.shopify.com/s/files/1/0431/1829/7245/files/natarujelozulikozem.pdf
    • https://cdn.shopify.com/s/files/1/0437/3420/4568/files/91675690489.pdf
    • https://cdn.shopify.com/s/files/1/0443/9130/1286/files/carnitine_shuttle.pdf
    • https://cdn.shopify.com/s/files/1/0434/5751/1590/files/81424948137.pdf
    • https://cdn.shopify.com/s/files/1/0431/4375/7992/files/saints_row_3_cheats_for_ps3.pdf
    • https://cdn.shopify.com/s/files/1/0459/8602/1543/files/29210093070.pdf
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/83702367517.pdf
    • https://cdn.shopify.com/s/files/1/0432/1955/0370/files/9539607257.pdf
    • https://cdn.shopify.com/s/files/1/0433/2093/4558/files/dj_chetas_songs_2019.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/zefatelegoveletinumaru.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_off00006181.bin
8d3343e51761821d055076e2d3998098dd73d2dbd409de06a08b4ed188f4f377		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6181 5404 bytes
font_01_sfnt_off000073ef.bin
5a9b047623e875f27a8c29242b8d8e44d340e312d0b383c2a18a6f06bf01abc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73EF 10112 bytes

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