Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a61ef7aabebaf4f…

MALICIOUS

PDF

40.6 KB Created: 2020-08-30 19:38:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: abbaf0ce358cc2b8443dab5da58c436c SHA-1: 853cdfb58a2f93c5d62efefcb9a0e62fe5045516 SHA-256: 4a61ef7aabebaf4fe7e31864a8686287eafd55d38dca23e671a1621be36f1c4b
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/wix?keyword=bikini+bodybuilding+competition+workout+plan'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same redirector URL, suggesting it's the primary lure.

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.ru/wix?keyword=bikini+bodybuilding+competition+workout+plan
    • https://static.usrfiles.com/ugd/b8c837_c713d28071614c5aac8753dd346a5e5c.pdf
    • https://static.usrfiles.com/ugd/b8c837_3cba043c14bd4ee79519e9e6063bc1b0.pdf
    • https://static.usrfiles.com/ugd/87d215_1729598dcadd4f88bce0743957950b46.pdf
    • https://cdn.shopify.com/s/files/1/0437/1241/3851/files/buvaru.pdf
    • https://cdn.shopify.com/s/files/1/0432/4763/2548/files/83000180412.pdf
    • https://cdn.shopify.com/s/files/1/0433/1290/6405/files/32961991164.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/fokozinurutopagefe.pdf
    • https://cdn.shopify.com/s/files/1/0430/8749/5321/files/internal_audit_plan.pdf
    • https://static.usrfiles.com/ugd/b8c837_bd283b680f7540edaa1e482e831b5bc9.pdf
    • https://static.usrfiles.com/ugd/696b8a_20fc9e4f31a8455eabf34e074a806b1e.pdf
    • https://static.usrfiles.com/ugd/b0b521_378253406b6e443dbe69b3c3947ddcab.pdf
    • https://cdn.shopify.com/s/files/1/0433/1326/6846/files/good_lock_app_2019_apk.pdf
    • https://cdn.shopify.com/s/files/1/0437/0441/8459/files/livro_sobre_o_behaviorismo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5460/4198/files/97146693602.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_off00005f54.bin
1f5a3bec1945e4fe45af453025a24ccdb505bf828947cc9a9b97be053ed88643		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F54 5664 bytes
font_01_sfnt_off0000728b.bin
0556396cf3825c0608b95545d8ed9632eb273b948ed047f8f49624a558f82748		 pdf-font-stream PDF embedded font (sfnt) at offset 0x728B 10416 bytes

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