Malicious PDF — malware analysis report

Static analysis result for SHA-256 7582ade6539b9513…

MALICIOUS

PDF

36.6 KB Created: 2020-08-30 13:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2590ccfbaf259344f82094a3de2e435 SHA-1: 88231416e36a4e5b52655b3a6852f85d07a32272 SHA-256: 7582ade6539b9513272058cff1f71876fe8603b8f5d9cb4e2ea1d24885cdeeb6
150 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.club/wix?keyword=transitive+and+intransitive+verb+worksheet'. The document body, though heavily obfuscated, also contains this URL and appears to be a lure related to a 'transitive and intransitive verb worksheet'. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning attempt to distribute malicious content. No scripts were extracted from this sample.

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.club/wix?keyword=transitive+and+intransitive+verb+worksheet
    • https://cdn.shopify.com/s/files/1/0429/9869/4042/files/38735654822.pdf
    • https://cdn.shopify.com/s/files/1/0437/7706/5121/files/59490214732.pdf
    • https://cdn.shopify.com/s/files/1/0435/5850/2563/files/78774187674.pdf
    • https://cdn.shopify.com/s/files/1/0428/6971/9196/files/anki_drive_app.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_86bd3b476ea14b3daf775816cd3492a8.pdf
    • https://cdn.shopify.com/s/files/1/0428/7696/0924/files/86194190374.pdf
    • https://cdn.shopify.com/s/files/1/0435/1364/3167/files/vugosegutidonezo.pdf
    • https://static.usrfiles.com/ugd/7baf93_24decd35e31845ff981bc107d93e0199.pdf
    • https://static.usrfiles.com/ugd/b8c837_7bcc34a0377846cb9b108c067d771ad2.pdf
    • https://static.usrfiles.com/ugd/b8c837_782af9f86f0f42eb96f5965a607cb2f8.pdf
    • https://static.usrfiles.com/ugd/b8c837_7d17c65107c94a03ab9226ef1b37f8e8.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_off00005278.bin
1b98247ea2d1471be7cd8eba99d7effe5b2351a1fcecd9778ad74c60bdb25d70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5278 5184 bytes
font_01_sfnt_off00006427.bin
8b15ead894aa80e413d9a180b2cc1c03712c2f93614e7c8736f013690550bc91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6427 9848 bytes

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