Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e4659fadd3f3cb…

MALICIOUS

PDF

39.7 KB Created: 2020-08-31 14:38:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1787de58c5fba90646537b9cd70d730a SHA-1: f7340b87c6a9aaf59e56d076da9365e27a7f1a96 SHA-256: 85e4659fadd3f3cbde3a2b983058258b8a5876e3d988b58ef5126f97f9ecdb52
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One critical heuristic identified a direct link to known malicious redirector infrastructure at 'https://ttraff.com/wix?keyword=ice+hockey+stats+sheet'. The document body, though heavily obfuscated, contains this URL, indicating a lure to a 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=ice+hockey+stats+sheet
    • https://cdn.shopify.com/s/files/1/0438/0724/4450/files/sikiwoxizaje.pdf
    • https://cdn.shopify.com/s/files/1/0433/3230/5054/files/94368962709.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/voxetevew.pdf
    • https://cdn.shopify.com/s/files/1/0433/1359/4526/files/xuzofijitokodiwunovuture.pdf
    • https://static.usrfiles.com/ugd/63022f_366d9509979747a681e0166fe2b02961.pdf
    • https://cdn.shopify.com/s/files/1/0430/6301/7629/files/19842456982.pdf
    • https://cdn.shopify.com/s/files/1/0440/8714/8709/files/77420140531.pdf
    • https://static.usrfiles.com/ugd/1f5cef_aa3f5e1046374de29af22981eb6053ef.pdf
    • https://static.usrfiles.com/ugd/b8c837_683867d6f6ab4a2c85a21c86e6755aee.pdf
    • https://static.usrfiles.com/ugd/2ca22b_9d71188cab754881846b4c9e7bf1e277.pdf
    • https://static.usrfiles.com/ugd/09273f_20d242d5108d4ab9a26e70c66fa72521.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_off00005ec5.bin
744ddc802f1c673503a8cb44faf07a1e1e43dc10e8b42d7df27b6846cbf70939		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EC5 4864 bytes
font_01_sfnt_off00006f5a.bin
6ab6be446f11a99ea12c5d6d32e667f2d611adadf63f99e8e2c45ebd09223952		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F5A 10352 bytes

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