Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeb9ed9d2fbe4942…

MALICIOUS

PDF

50.0 KB Created: 2020-08-31 07:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c52e9806ba15ed5741e589702f98d6ff SHA-1: 0d6ea65c5b3e8c0122d089aa039387bc54d56f97 SHA-256: eeb9ed9d2fbe494255ea2ef262a7c56f6f0db40702262c1c56b3a0f90e5abac9
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics indicating it is a malicious redirector and part of a link farm. The embedded URL, https://ttraff.com/wix?keyword=benefits+of+extracurricular+activiti, is identified as a known malicious redirector. The document body, though heavily obfuscated, contains this URL, suggesting the primary purpose is to lure users to this malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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/wix?keyword=benefits+of+extracurricular+activiti
    • https://cdn.shopify.com/s/files/1/0436/5733/0853/files/50455747948.pdf
    • https://cdn.shopify.com/s/files/1/0447/4509/7365/files/19848490028.pdf
    • https://cdn.shopify.com/s/files/1/0463/4666/6146/files/cartesian_to_polar_coordinates_examples.pdf
    • https://cdn.shopify.com/s/files/1/0432/5546/4104/files/53136919379.pdf
    • https://static.usrfiles.com/ugd/b6bf5b_4dd1d678f8f44f9aa8c7fbe9e53fb91b.pdf
    • https://cdn.shopify.com/s/files/1/0431/4729/6924/files/poxewozifuweterodewele.pdf
    • https://cdn.shopify.com/s/files/1/0434/9073/8328/files/11132388395.pdf
    • https://cdn.shopify.com/s/files/1/0433/7503/4520/files/fusionner_deux_documents_en_un.pdf
    • https://cdn.shopify.com/s/files/1/0429/0635/3823/files/pretest_biochemistry_4th_edition.pdf
    • https://static.usrfiles.com/ugd/b8c837_0d46246278af41a0b8c48b5e2f54b59c.pdf
    • https://static.usrfiles.com/ugd/735424_a95d7ed7d5f54f178ea37f9dd476c3be.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_off000086b0.bin
b45296dc034c1a63779dee50305d31f9285838c4991fffe574de6185f525f7c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86B0 5052 bytes
font_01_sfnt_off000097f5.bin
d8ff257d28aa26c5afb0abed628de39e8a012346428c07bf40efac3e2da14e0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97F5 10312 bytes

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