Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f3396c54bfd3afa…

MALICIOUS

PDF

47.3 KB Created: 2020-08-10 10:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0606377a721fe9773d444dd8c0e65071 SHA-1: 2c72f2cd958b21a05ba36a2a8a2b35b7bd1b304e SHA-256: 9f3396c54bfd3afaa8f51ff394f5b928d9621368d75b1fb4f06ec06b64c70cd0
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF document that exhibits characteristics of a link farm or SEO manipulation. It contains a large number of embedded links to external PDF files, with a critical heuristic firing for PDF_SEO_LINK_FARM. One of these links, https://ttraff.cc/pify?keyword=biotina+bula+pdf, is identified as a malicious redirector. The ML classifier also flagged this PDF as malicious with high confidence.

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=biotina+bula+pdf
    • http://files.huckleberryhideout.com/uploads/1/3/1/4/131437987/9749361.pdf
    • http://files.grandcountyems.com/uploads/1/3/1/1/131164428/4616053.pdf
    • http://files.swiftmotorhomesownersclub.co.uk/uploads/1/3/2/3/132303312/2084215.pdf
    • https://cdn.shopify.com/s/files/1/0430/7573/1616/files/lofewimakezikafuwavabo.pdf
    • https://cdn.shopify.com/s/files/1/0444/4097/7574/files/what_is_isotonic_example.pdf
    • https://cdn.shopify.com/s/files/1/0435/6977/4750/files/logefixuvuxeloz.pdf
    • https://cdn.shopify.com/s/files/1/0428/8941/2767/files/97403394043.pdf
    • https://cdn.shopify.com/s/files/1/0435/4159/4266/files/borofiso.pdf
    • https://cdn.shopify.com/s/files/1/0435/1347/9320/files/babafemamato.pdf
    • https://cdn.shopify.com/s/files/1/0437/3217/2965/files/68895717000.pdf
    • https://cdn.shopify.com/s/files/1/0431/1007/2481/files/duzosinavozujixom.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/45484104345.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/stranger_things_text.pdf
    • https://cdn.shopify.com/s/files/1/0435/0846/5828/files/wapajora.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_off00006fe8.bin
26adc477c22731b72b2d6b094db9f8657fcf2031a61f2997b410f5af788dc234		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FE8 4716 bytes
font_01_sfnt_off00007fec.bin
a246696c6354f7d0752b13cdf02830057d05017e2ce15b9cb45202d5caf50032		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FEC 10140 bytes
font_02_sfnt_off0000a2a2.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2A2 4324 bytes

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