Malicious PDF — malware analysis report

Static analysis result for SHA-256 c537bdf13c584937…

MALICIOUS

PDF

54.5 KB Created: 2020-09-04 23:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0186b1a5df4287100e56dd6e83b7bea1 SHA-1: 967ba90c223ab5f6139e577169d6d40494e47375 SHA-256: c537bdf13c58493766aedf6ca8aa43eef6bfef0bc7e8b6198d6ecaa990744972
150 Risk Score

Malware Insights

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

The PDF contains a link farm of 22 external PDF links, with the primary malicious redirector being ttraff.cc. The document body, though heavily obfuscated, contains the same redirector URL. The ML classifier also flagged this PDF with high confidence. The presence of numerous external links suggests an attempt to distribute malicious content or lead users to phishing sites.

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.cc/pify?keyword=bonjour+comment+ca+va+worksheet
    • https://cdn.shopify.com/s/files/1/0440/5025/1941/files/zijanigovadurawofidis.pdf
    • https://cdn.shopify.com/s/files/1/0434/3313/2184/files/51147318196.pdf
    • https://cdn.shopify.com/s/files/1/0436/0024/8995/files/caballero_de_oriente_y_occidente.pdf
    • https://static.usrfiles.com/ugd/565485_9c0845ee12704519b5224f904906d90a.pdf
    • https://cdn.shopify.com/s/files/1/0434/5485/7369/files/lowari.pdf
    • https://cdn.shopify.com/s/files/1/0433/3495/9263/files/79553317582.pdf
    • https://cdn.shopify.com/s/files/1/0429/6717/1223/files/vodabisez.pdf
    • https://static.usrfiles.com/ugd/d7ba0f_637a848e6fa145e29b9e781d2559c77e.pdf
    • https://static.usrfiles.com/ugd/338562_c8266e12a7e34f6a99d8dbb3376485c9.pdf
    • https://static.usrfiles.com/ugd/a4e402_a39346c3c1294cee83be57fa1637f0c6.pdf
    • https://static.usrfiles.com/ugd/79e0dc_cbf7b667ce1b4a7e97ca98f84e3364db.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e17.bin
e1ff1e80c57f5ccd7f19d85b2277a41adf1cebb64f4c1e13f77d5037df5385c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E17 5184 bytes
font_01_sfnt_off00007f9a.bin
ab0d00a9be0daaca22680a2f4ab72fcca33f81d8e5601fd3914019d20d175141		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F9A 12860 bytes
font_02_sfnt_off0000a951.bin
9b18a8a817f1d3ed05b91fb5e05224cf1935c28ab90f34125a8ca9bfa63d7a69		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA951 16236 bytes
font_03_sfnt_off0000becf.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBECF 4324 bytes

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