Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d292e20d27463e8…

MALICIOUS

PDF

42.0 KB Created: 2020-09-12 19:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c25d87eac21dfd86ed9aadba6b374976 SHA-1: e44cdcac1017d518c17c53fb414a196294e7187e SHA-256: 7d292e20d27463e8042993e5eb2c8d8b5b88eaa8038789ffaa18e33c8487f48a
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, directing users to 'https://ttraff.link/wix?keyword=worksheet+3+ser+vs+estar+answers'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links pointing to various domains, many of which are likely malicious. The ML classifier strongly supports the malicious nature of this PDF. The document body, though heavily obfuscated, contains the same malicious URL, reinforcing the lure.

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.link/wix?keyword=worksheet+3+ser+vs+estar+answers
    • http://raketal.westerhausmetals.com/uploads/1/3/1/6/131637789/gademanit.pdf
    • http://ximinuvo.pestcontrolbrampton.org/uploads/1/3/0/9/130968988/e6a5fe39aee.pdf
    • http://files.thebathbombshop.co.uk/uploads/1/3/1/4/131438308/berokododa.pdf
    • http://rulokake.thedesignsourceltd.com/uploads/1/3/1/6/131637881/vutupefaz.pdf
    • http://kiserixa.perimeterdrainagevictoria.com/uploads/1/3/1/3/131379698/virofisezesa.pdf
    • http://pomova.kitchenettecuisine.com/uploads/1/3/1/8/131856005/627316.pdf
    • http://denota.tennaros.org/uploads/1/3/2/8/132814900/6862960.pdf
    • https://cdn.shopify.com/s/files/1/0437/7490/2430/files/go_math_assessment_guide_grade_5.pdf
    • https://cdn.shopify.com/s/files/1/0433/1329/9620/files/6789133408.pdf
    • https://cdn.shopify.com/s/files/1/0432/8158/0188/files/gakifememonukitatetati.pdf
    • https://static.usrfiles.com/ugd/63d3ad_54ea6b029a73456cae24d770fd62e8c5.pdf
    • https://static.usrfiles.com/ugd/b8c837_dbef19994c02481a98afd43b7786c9c2.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_off000066d2.bin
3821b745d2bdea447d5bf20de3491a1997d438e5c8c6e984fbf2ce18ef81ef09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66D2 5136 bytes
font_01_sfnt_off0000785e.bin
83622cba60f4345c44b566adb2c0cb0c63baa361b90a618944520c4f319e3378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x785E 10148 bytes

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