Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b99bdabc382e80…

MALICIOUS

PDF

49.1 KB Created: 2020-07-29 07:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b249a2e2c9202c4c05c80deb252ad914 SHA-1: 64d1cf2027889f20b3c455602a4109beadc5f00b SHA-256: f3b99bdabc382e80814e3ce23feca8f2104056a86b45b877aacb59afc4c8b2fb
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains embedded links, with one pointing to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, suggests a lure related to an 'Esmo 2019 report breast cancer'. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm strategy. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it's designed to redirect users to harmful content.

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=esmo+2019+report+breast+cancer
    • http://files.abbyvolcansek.com/uploads/1/3/1/4/131453394/cff5340190517e.pdf
    • http://files.hennamaiden.com/uploads/1/3/1/4/131409090/vorofo.pdf
    • http://files.southportcls.com.au/uploads/1/3/1/4/131437423/zuwilowotemug.pdf
    • https://cdn.shopify.com/s/files/1/0432/1535/6067/files/famunoratosexejizo.pdf
    • https://cdn.shopify.com/s/files/1/0434/9375/2997/files/63340089057.pdf
    • https://cdn.shopify.com/s/files/1/0430/9119/8112/files/radukezezatusarazo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3319/8745/files/10678632318.pdf
    • https://cdn.shopify.com/s/files/1/0431/0741/8273/files/sipije.pdf
    • https://cdn.shopify.com/s/files/1/0434/7445/2632/files/wopuzopizafedux.pdf
    • https://cdn.shopify.com/s/files/1/0436/3422/9398/files/zuxezinu.pdf
    • https://cdn.shopify.com/s/files/1/0428/8564/4447/files/23177399124.pdf
    • https://cdn.shopify.com/s/files/1/0437/2699/5621/files/73216268909.pdf
    • https://cdn.shopify.com/s/files/1/0433/2368/7067/files/koduloporurerubivugorewe.pdf
    • https://cdn.shopify.com/s/files/1/0434/2962/6017/files/fixuzenegexo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1403/7409/files/vodafobupoziwapiwi.pdf
    • https://cdn.shopify.com/s/files/1/0429/5124/5987/files/guruwajevavolikipub.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_off000081b9.bin
ed02bac1219d3d2b43545e646f5ed34f3ffda1fd4214e55406b8d72425d88d6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81B9 5368 bytes
font_01_sfnt_off000093c8.bin
994ee13c2166f91b5debb07bd5dedb0f4a2e693a03636279b39c6ba8c082c658		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93C8 10372 bytes

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