Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2d73ec7f6a95fc9…

MALICIOUS

PDF

42.0 KB Created: 2020-08-04 06:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b86bc9c601a7320ca743b150b64e6ac9 SHA-1: ed69c5e5d30dd8fde1568ff57a35dc8a82ea1ce5 SHA-256: a2d73ec7f6a95fc92846c5755aeb886feebcfc96300a5f8c3d2bd0a8d18fed5e
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, https://ttraff.ru/pify?keyword=urinary+system+functions+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect the user to malicious infrastructure. 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.ru/pify?keyword=urinary+system+functions+pdf
    • http://files.jimbosphotobooth.com/uploads/1/3/1/8/131871467/d6b430f04dc4c.pdf
    • http://files.socalfcboosters.org/uploads/1/3/0/7/130776489/9959126.pdf
    • http://files.metis8.com/uploads/1/3/0/9/130969572/2689818.pdf
    • http://files.interactive-maths.com/uploads/1/3/1/3/131397964/nojanulujowumujesi.pdf
    • http://vubugasex.heathersharkey.com/uploads/1/3/1/4/131452922/b31a2932fa395f5.pdf
    • https://cdn.shopify.com/s/files/1/0434/4948/3426/files/17656813954.pdf
    • https://cdn.shopify.com/s/files/1/0430/7887/7337/files/sanibel_island_tide_chart.pdf
    • https://cdn.shopify.com/s/files/1/0430/8995/2922/files/16182691404.pdf
    • https://cdn.shopify.com/s/files/1/0432/7417/4622/files/83532621971.pdf
    • https://cdn.shopify.com/s/files/1/0436/2331/7662/files/xofiwawawezugu.pdf
    • https://cdn.shopify.com/s/files/1/0439/2137/5387/files/fap_titans_cheats.pdf
    • https://cdn.shopify.com/s/files/1/0431/1135/0439/files/88389631442.pdf
    • https://cdn.shopify.com/s/files/1/0438/0386/9346/files/96622516554.pdf
    • https://cdn.shopify.com/s/files/1/0432/3019/9966/files/92580476077.pdf
    • https://cdn.shopify.com/s/files/1/0434/6085/3912/files/21646842599.pdf
    • https://cdn.shopify.com/s/files/1/0427/5470/3526/files/mercruiser_alpha_one_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/5725/8395/files/41471981671.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6976/files/rukelodiromoli.pdf
    • https://cdn.shopify.com/s/files/1/0440/6486/6469/files/xafofujidozerokemex.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_off000065dd.bin
3be65802748799118f782717fd2daa3ea6fe3e030f8e55c2fd48b472f6dfbc65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65DD 5360 bytes
font_01_sfnt_off0000780f.bin
346f4eb4d50e97c1703193898c2fbd3188815d557cb358ee042400929049ee19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x780F 10156 bytes

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