Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6a5e3de1f786036…

MALICIOUS

PDF

40.8 KB Created: 2020-10-09 05:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae43001dd507eadc729243af7174adba SHA-1: 79c4f3dd24ba8301bbcbbde96136eb400da6a9a8 SHA-256: f6a5e3de1f78603653f421d7483bbc1cb016102948aae45196f6abe8393ec599
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, identified as a link farm, directing users to potentially malicious redirectors. The primary malicious URL observed is https://cctraff.ru/pify?keyword=solving+quadratic+equations+by+graphing+practice. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to disguise malicious links within seemingly legitimate content. 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://cctraff.ru/pify?keyword=solving+quadratic+equations+by+graphing+practice
    • http://files.mathbag.com/uploads/1/3/2/7/132710797/nudexakuzugokupipeku.pdf
    • http://files.steppingstonesproject.org/uploads/1/3/0/8/130815437/bemiwox.pdf
    • http://busiroso.aocnola.com/uploads/1/3/1/0/131069839/1076255.pdf
    • http://files.misfitcrusaders.com/uploads/1/3/0/8/130814672/634f8e.pdf
    • http://dimoze.sunshinesfootballclinic.org/uploads/1/3/2/6/132683014/riganafilalo.pdf
    • http://files.coburnsandandgravel.com.au/uploads/1/3/0/7/130739536/venumebukukujilab.pdf
    • http://files.groove-consulting.com/uploads/1/3/0/8/130874104/pizisomes.pdf
    • http://nixex.koreanucc.org/uploads/1/3/1/4/131407668/lilekovowavifobij.pdf
    • http://nigixe.oregonahsgr.org/uploads/1/3/1/6/131606113/6c74cf346976.pdf
    • http://gafad.mainstreamdanceacademy.com/uploads/1/3/1/6/131637881/9188f.pdf
    • https://cdn.shopify.com/s/files/1/0486/4324/4200/files/ruxiz.pdf
    • https://cdn.shopify.com/s/files/1/0482/5035/5866/files/what_is_zero_suit_samus_real_name.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_off0000607e.bin
778416bf9678d2bb1622c8f165f499d36ec6699139c4731c8c8514b1508afb1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x607E 5864 bytes
font_01_sfnt_off0000746c.bin
d4f0c11d6d22099ac21cfd435fc9cddf2004926ed09cadb77fdcfb8278f175b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x746C 9916 bytes

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