Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e7e551b246fc741…

MALICIOUS

PDF

47.5 KB Created: 2020-09-02 09:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1c55896035a1f34c2214c8fd9918be4 SHA-1: fd5ede0e8ae33992a02307b1ff9e6ab5f7fe5a70 SHA-256: 8e7e551b246fc74107a9fd24bf6d8e8ea1fd3b2484cd61e75e3d5ccc01baf06b
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.club'. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on 'static.usrfiles.com'. 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=apple+body+shape+style+guide
    • https://static.usrfiles.com/ugd/b8c837_9606e8de32fc4678b6a6a434a3988853.pdf
    • https://static.usrfiles.com/ugd/b6edda_51733c23446048b39400613c9a2598a1.pdf
    • https://static.usrfiles.com/ugd/b8c837_c9cfdad9411f46a3af873fc3decc710c.pdf
    • https://static.usrfiles.com/ugd/cac9e4_dcda81217e444ef38348daad5ed84dff.pdf
    • https://static.usrfiles.com/ugd/97493d_ca6e39e9c84646398c8ee2d971e1297f.pdf
    • https://cdn.shopify.com/s/files/1/0432/7997/4556/files/tijeregomogubogiza.pdf
    • https://static.usrfiles.com/ugd/b8c837_496b057afb8d4dd8bef8a6d1c2d62ece.pdf
    • https://static.usrfiles.com/ugd/e8506d_db535b8283f143e484ec9cde95e1c7b3.pdf
    • https://static.usrfiles.com/ugd/b8c837_0675bf0d342c4dc788b86726e2943cd5.pdf
    • https://static.usrfiles.com/ugd/6f5f23_e6a2e5a8948b47949fadbfb85568c06d.pdf
    • https://cdn.shopify.com/s/files/1/0428/9665/4489/files/sample_psychological_evaluation_report_child.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xigidewepiwunabifaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ruketisoren.pdf
    • https://cdn.shopify.com/s/files/1/0450/3791/2214/files/basic_calculus_grade_11_stem.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f0e.bin
c1ba5c86e427705543bacb1cf5ba773e6c78cd659eea5fc3c8118de8e453a5a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F0E 5132 bytes
font_01_sfnt_off0000808d.bin
dabc10e19efdd3dae8dc23a0874f5e810556be9eb04023b86a4dfb5469a8b9ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x808D 10096 bytes
font_02_sfnt_off0000a318.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA318 4324 bytes

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