Malicious PDF — malware analysis report

Static analysis result for SHA-256 208821ba4e40cac1…

MALICIOUS

PDF

44.1 KB Created: 2020-08-02 00:37:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c413ba6f54eec18e5d1adf3ae7d2842c SHA-1: c52849dc49ffa70b98ec9141f6b08046726cfc2e SHA-256: 208821ba4e40cac18f402139cf6e536708c824fc59b45c16016cfc0e2800af7b
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 firing for a malicious redirector at 'https://ttraff.com/pify?keyword=word+count+in+r'. The document body is heavily obfuscated, but the presence of this malicious URL and the PDF_SEO_LINK_FARM heuristic indicate a likely attempt to lure the user to malicious content. No scripts were extracted from this sample.

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.com/pify?keyword=word+count+in+r
    • http://files.eedstanzania.org/uploads/1/3/1/0/131070434/38ff526c32c96a.pdf
    • http://files.mukilteohouseofwax.com/uploads/1/3/2/8/132816096/5998932.pdf
    • http://files.franklinpaint.com/uploads/1/3/0/8/130874627/24d91ea6.pdf
    • https://cdn.shopify.com/s/files/1/0431/2068/9306/files/12356354348.pdf
    • https://cdn.shopify.com/s/files/1/0431/4998/3905/files/56551141003.pdf
    • https://cdn.shopify.com/s/files/1/0430/8844/5604/files/18121803839.pdf
    • https://cdn.shopify.com/s/files/1/0431/8697/8984/files/26918573630.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6505/files/15306373368.pdf
    • https://cdn.shopify.com/s/files/1/0431/0676/2905/files/wivuguwinuzakasejuvum.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/texigusowemojegovivek.pdf
    • https://cdn.shopify.com/s/files/1/0427/8000/0423/files/78834755587.pdf
    • https://cdn.shopify.com/s/files/1/0428/8266/2553/files/nibenivugudatemirunove.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gozoba.pdf
    • https://cdn.shopify.com/s/files/1/0430/0396/9689/files/772562339.pdf
    • https://cdn.shopify.com/s/files/1/0431/4834/5500/files/tidewuzobavadedurozud.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_off00006351.bin
d56dd340e448d8749d500e8b7b85ebbb360da2e1f847fbf4239f035eb39e3d7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6351 4524 bytes
font_01_sfnt_off000072d3.bin
c608f1c90c80e02251a927455e09e9d261990dc9b407588cbce43743c61908d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72D3 15800 bytes

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