Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ba4d2ef89fb18d…

MALICIOUS

PDF

41.9 KB Created: 2020-08-22 01:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5010dc305e5c06da4df4f54b55012376 SHA-1: 9e4011aaf54254767b9cd1d819a011d077e6a739 SHA-256: 21ba4d2ef89fb18d6d47c6f4d86b8d0ad513fab7d1dee05bedcfd3567a3bdb4c
120 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, directing users to a URL associated with malicious activity. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many hosted on Shopify. The document body, though heavily obfuscated, contains the primary malicious URL and several benign-looking Shopify URLs, likely used to mask the malicious intent. The primary malicious URL is 'https://ttraff.ru/pify?keyword=inductive+reasoning+worksheet+geometry', which is designed to redirect users to further malicious content.

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.ru/pify?keyword=inductive+reasoning+worksheet+geometry
    • http://files.jehoshuabrown.com/uploads/1/3/0/7/130775205/tezifuza.pdf
    • http://nojasekak.kncperformingartscompany.com/uploads/1/3/1/4/131437208/woduliluteja.pdf
    • http://files.threesisterscommunityfarm.com/uploads/1/3/1/1/131164176/87cc6bc.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/nemivedupabevunimetu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1586/3447/files/43109074721.pdf
    • https://cdn.shopify.com/s/files/1/0437/8984/4631/files/21353639397.pdf
    • https://cdn.shopify.com/s/files/1/0437/4953/9989/files/86389643186.pdf
    • https://cdn.shopify.com/s/files/1/0434/5780/6486/files/20646776661.pdf
    • https://cdn.shopify.com/s/files/1/0431/9117/3282/files/cassandra_java_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0438/3532/6624/files/real_estate_lease_addendum_form.pdf
    • https://cdn.shopify.com/s/files/1/0430/0311/7721/files/holistic_nursing_scope_and_standards_of_practice.pdf
    • https://cdn.shopify.com/s/files/1/0429/8348/9687/files/22672029944.pdf
    • https://cdn.shopify.com/s/files/1/0432/3940/7784/files/mixefuzumasiguvawawodek.pdf
    • https://cdn.shopify.com/s/files/1/0431/6823/5675/files/59012158369.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_off0000658f.bin
9c94b6d26eb4654868f4f1bf1e0657c9c06e21259068788bd8b4eb95b22c1a07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x658F 5576 bytes
font_01_sfnt_off0000786e.bin
3a63f8a8a2c295bebc4c9e3797d2a20b1d354cc8d5d1eb8a8e554770a9758b90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x786E 10048 bytes

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