Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8b0703c72842f85…

MALICIOUS

PDF

46.1 KB Created: 2020-09-20 11:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9cf2edc5724da924ccde88e4a126113c SHA-1: 4a47e12a6aa66b9b7f264065d16f6d042b4907d0 SHA-256: b8b0703c72842f85ae1e502dca94e3f5011ac5793ac190c3d96bdc1e37c271ba
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a malicious redirector link disguised as a free font download. This link, 'https://ttraff.club/wix?keyword=the+great+gatsby+font+free+download', leads to known malicious infrastructure. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to Shopify, likely to obscure the malicious destination. The ML classifier strongly supports the malicious nature of this PDF.

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.club/wix?keyword=the+great+gatsby+font+free+download
    • https://cdn.shopify.com/s/files/1/0440/5339/7654/files/95350404245.pdf
    • https://cdn.shopify.com/s/files/1/0435/9903/6573/files/59259586042.pdf
    • https://cdn.shopify.com/s/files/1/0438/5538/0630/files/21743616966.pdf
    • https://cdn.shopify.com/s/files/1/0481/6968/1047/files/mscoree.dll_missing_windows_server_2016.pdf
    • https://cdn.shopify.com/s/files/1/0429/9682/6261/files/fogiwigujavewowumuzubur.pdf
    • https://cdn.shopify.com/s/files/1/0431/4362/6912/files/pillars_of_eternity_classes_guide.pdf
    • https://cdn.shopify.com/s/files/1/0427/9785/8972/files/lewufepirorojekenumesa.pdf
    • https://cdn.shopify.com/s/files/1/0438/3929/1554/files/karemunilafinepupa.pdf
    • https://cdn.shopify.com/s/files/1/0432/2577/6288/files/matura_angielski_wiczenia_leksykalno_gramatyczne.pdf
    • https://cdn.shopify.com/s/files/1/0466/3200/9893/files/11974662741.pdf
    • https://cdn.shopify.com/s/files/1/0434/8405/3669/files/77876066837.pdf
    • https://cdn.shopify.com/s/files/1/0436/4474/7929/files/baines_school_uniform.pdf
    • https://cdn.shopify.com/s/files/1/0430/7930/3317/files/architectural_case_study_examples.pdf
    • https://cdn.shopify.com/s/files/1/0447/3644/6613/files/yms_cool_cat.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_off0000768c.bin
48d87532681e018b7b46448dc46f569e8004f9312553aa3e3f17b0737a3aec46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x768C 5452 bytes
font_01_sfnt_off00008927.bin
d9dfbea34d40c74d01c59b61501f92311eea5e1a8ad3d99364bdd6ddc0207bea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8927 10168 bytes

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