Malicious PDF — malware analysis report

Static analysis result for SHA-256 72e691587eafc5b9…

MALICIOUS

PDF

47.9 KB Created: 2020-08-02 09:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb403cebae72b510f4421eead0a7e0df SHA-1: 9320284d5115d0c0163c53981db4c3d84845a7a3 SHA-256: 72e691587eafc5b974f9004b7804f2c161f0d491b1cbfa02fe81dda0de0c11c7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://ttraff.com/pify?keyword=singleton+design+pattern+in+c%252B%252B. Additionally, it exhibits characteristics of a PDF link farm, containing numerous external PDF links, many of which point to Shopify domains. The ML classifier also strongly flagged this PDF as malicious. The embedded document body text, though partially corrupted, contains the same malicious URL, suggesting an attempt to lure users to a potentially harmful 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/pify?keyword=singleton+design+pattern+in+c%252B%252B
    • http://files.sharonviewcorpcenter.com/uploads/1/3/1/1/131164308/wofutojojefume_turemomid_nisanigoku.pdf
    • http://files.perfect-stride.com/uploads/1/3/0/7/130740191/putaxevatovofidewar.pdf
    • http://files.peoplesresponseteamchicago.org/uploads/1/3/1/3/131379382/9654654.pdf
    • http://files.cynthiahoyle.com/uploads/1/3/2/3/132303374/281795b96f9f59.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1567/5809/files/64541596562.pdf
    • https://cdn.shopify.com/s/files/1/0432/8374/2884/files/virilopaxeduvisozab.pdf
    • https://cdn.shopify.com/s/files/1/0437/2011/4331/files/84046870671.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4017/files/dagotaxojorerure.pdf
    • https://cdn.shopify.com/s/files/1/0435/1531/4330/files/zutajujomifinelojiv.pdf
    • https://cdn.shopify.com/s/files/1/0431/0492/7905/files/natawanegoromij.pdf
    • https://cdn.shopify.com/s/files/1/0428/8475/9711/files/lamos.pdf
    • https://cdn.shopify.com/s/files/1/0428/3544/3875/files/xebapufinumezavaf.pdf
    • https://cdn.shopify.com/s/files/1/0440/3786/5637/files/43841115968.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/48787523288.pdf
    • https://cdn.shopify.com/s/files/1/0430/8867/4967/files/75413635080.pdf
    • https://cdn.shopify.com/s/files/1/0430/9513/0266/files/wogatupixutiw.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/tuwapewubapeler.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007681.bin
304915ef4ce45246439c2b728fd84593ad7586b562051ddd1526c24ac12b90e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7681 5344 bytes
font_01_sfnt_off000088bc.bin
53dede398a63ab661542535e03883a7d199e29c5d3fc5c7bfa3acc9e5db56137		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88BC 13116 bytes

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