Malicious PDF — malware analysis report

Static analysis result for SHA-256 37f4a9cbe3684a0d…

MALICIOUS

PDF

43.4 KB Created: 2020-08-30 23:27:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02edeb6c87716f976f8b85004182b787 SHA-1: a4575bc181c30bfebd9d1f3eff4437b986e5cbb8 SHA-256: 37f4a9cbe3684a0df5c2e603e600ee43b0fa1f02c42100d7bf37bfe6971b4fc0
150 Risk Score

Malware Insights

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

The PDF file contains a link farm, with multiple embedded URLs pointing to external PDF documents. One of these URLs, https://ttraff.ru/wix?keyword=water+desalination+london, is identified as a malicious redirector. The document body, though heavily corrupted, appears to contain the same redirector URL and keywords related to SEO, suggesting a phishing or scam attempt.

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=water+desalination+london
    • https://static.usrfiles.com/ugd/7f16bd_8b9622f323004b6cb96601471ccfc250.pdf
    • https://static.usrfiles.com/ugd/8a419d_4a88ec561d964059ae26d6b0561b1a66.pdf
    • https://static.usrfiles.com/ugd/9b33c5_86dd585f857a4c3aa04b84b6a6ae3155.pdf
    • https://cdn.shopify.com/s/files/1/0462/4436/4448/files/11579919021.pdf
    • https://cdn.shopify.com/s/files/1/0428/5726/7359/files/an_inspector_calls_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3809/files/britannica_free_download.pdf
    • https://static.usrfiles.com/ugd/b8c837_34146b85622e46a5aed24239f8c9cece.pdf
    • https://static.usrfiles.com/ugd/0a593f_1953f70c85e647a89acd78b6bdc8a8a4.pdf
    • https://static.usrfiles.com/ugd/b8c837_71ee7a45dfad423e9b5932f2d52fef28.pdf
    • https://static.usrfiles.com/ugd/b8c837_263d4133e17c4f9e95aaa360348159d3.pdf
    • https://static.usrfiles.com/ugd/2074c9_78d53a0390784d60a8326499b07dcd8c.pdf
    • https://static.usrfiles.com/ugd/b8c837_d71be1e5321a4eb18819c86c033dffa5.pdf
    • https://static.usrfiles.com/ugd/516793_548c495edffb476fb956cf7a559bc974.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_off00006d4e.bin
b3f5e5b41de836530be24d8078e25bd4fa779deb48c719ff9b15a24af4c057dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D4E 4832 bytes
font_01_sfnt_off00007dd2.bin
ee5e3cf6aa240bd6288949e19f5085b09c74ca38c57075918e28087612bf3fb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DD2 10304 bytes

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