Malicious PDF — malware analysis report

Static analysis result for SHA-256 9993c5c1b113d016…

MALICIOUS

PDF

50.4 KB Created: 2020-08-19 18:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a693d83c8549b2ea59eb0a99b5d09bc7 SHA-1: 193a5f1d6d01122c6c4292b7996d67bf98d204d0 SHA-256: 9993c5c1b113d0169f8661ee63c8f9dc5963d140dd9585f67d5ece51fafb6ca8
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL and appears to be a lure for an 'employee schedule template'. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm designed to obscure the malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

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.com/pify?keyword=simple+employee+schedule+template+excel
    • http://files.allgeierchiropractic.com/uploads/1/3/1/3/131378776/begomixanasivar.pdf
    • http://subun.thebathbombshop.co.uk/uploads/1/3/1/3/131398252/4576136.pdf
    • https://cdn.shopify.com/s/files/1/0431/9186/1410/files/bufar.pdf
    • https://cdn.shopify.com/s/files/1/0460/6502/5179/files/23936579647.pdf
    • https://cdn.shopify.com/s/files/1/0432/1758/4285/files/52084384048.pdf
    • https://cdn.shopify.com/s/files/1/0450/8735/9141/files/guideline_value_in_velachery.pdf
    • https://cdn.shopify.com/s/files/1/0437/9312/1442/files/pomazifiriwavedusas.pdf
    • https://cdn.shopify.com/s/files/1/0435/7079/0558/files/xefolijotef.pdf
    • https://cdn.shopify.com/s/files/1/0434/5459/5224/files/moxakezedowonoz.pdf
    • https://cdn.shopify.com/s/files/1/0431/9235/2932/files/pufoz.pdf
    • https://cdn.shopify.com/s/files/1/0437/6536/6933/files/business_level_strategy.pdf
    • https://cdn.shopify.com/s/files/1/0435/2029/5064/files/33922420666.pdf
    • https://cdn.shopify.com/s/files/1/0436/4494/4542/files/steel_dragon_task_guide_osrs.pdf
    • https://cdn.shopify.com/s/files/1/0428/2171/4079/files/kadijubelowitosudop.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_off000086be.bin
3a40d245f9c4cbda75f3d3c5a86ef34b1481d1098013c9141f5e87a54a1e1787		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86BE 5492 bytes
font_01_sfnt_off00009951.bin
afbd42270865e947b34a4a5d98f45788814a7dc2e5463e370ae4762bebf38257		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9951 10244 bytes

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