Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fe562824d7377b5…

MALICIOUS

PDF

39.9 KB Created: 2020-09-02 04:16:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a64b53a8876cdddeb84b3ccad4c2df31 SHA-1: c3740162542c377bae074a2c2af001398f01acc6 SHA-256: 3fe562824d7377b55aded316ad0a7c0966b446e90fcdcee84dfff9ba0bf42a88
150 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/wix?keyword=new+hd+couple+pic', which is flagged as malicious. The presence of a link farm and the ML classifier's high confidence score further support the malicious nature of this document, likely intended to redirect users to harmful content.

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/wix?keyword=new+hd+couple+pic
    • https://static.usrfiles.com/ugd/374ce0_a193a96c9589485c98926b4cf9f5e2bd.pdf
    • https://static.usrfiles.com/ugd/1decf9_649a6c08ebc24822987bc5d68e76c9d6.pdf
    • https://static.usrfiles.com/ugd/dc98cc_79594cf5d2314721ae9467264bf05a76.pdf
    • https://cdn.shopify.com/s/files/1/0463/1517/6096/files/wifumorol.pdf
    • https://static.usrfiles.com/ugd/269bb8_133b766c2d464f0f8446109bfa9e2669.pdf
    • https://static.usrfiles.com/ugd/b8c837_6ed8935f978a4a2e8e66d38e56bbc9ac.pdf
    • https://cdn.shopify.com/s/files/1/0449/3590/5448/files/1st_grade_writing_complete_sentences_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0429/3437/0470/files/alvin_and_the_chipmunks_1983.pdf
    • https://cdn.shopify.com/s/files/1/0431/1633/1172/files/biodegradation_and_bioremediation_martin_alexander.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/wakofilaza.pdf
    • https://cdn.shopify.com/s/files/1/0440/2076/0741/files/natural_food_toxins.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_off00005398.bin
1a624c46412fabb096fed96bb719cb81f6b4ada3a099edf365dac9e55bedb909		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5398 4740 bytes
font_01_sfnt_off000063ce.bin
51f6550629fb41313498c009122e7d5d21b15e0e5fa281ce5493ff78fa37561a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63CE 14636 bytes

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