Malicious PDF — malware analysis report

Static analysis result for SHA-256 a16262be228a367a…

MALICIOUS

PDF

51.5 KB Created: 2020-09-10 05:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01347a36edc0d91659a02509b6975780 SHA-1: 64ca75131ba36f3f665938a1844e85cfa6a8784f SHA-256: a16262be228a367ab8b9d28b19bcee2ec8a55b02624a13abd7c9c70dff305f77
150 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many of which point to a link farm designed to distribute further malicious content. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.com/wb?keyword=foundations%20in%20personal%20finance%20chapter%209%20test%20answer%20key%20pdf'. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the link farm and redirector strongly suggest a phishing or malware delivery attempt.

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/wb?keyword=foundations%20in%20personal%20finance%20chapter%209%20test%20answer%20key%20pdf
    • http://fefevuro.bo-co-wandering.com/uploads/1/3/1/0/131070872/gotupalabogi.pdf
    • http://files.egyptiangift179.com/uploads/1/3/0/8/130874110/kirevu_potakapa_wokozogo.pdf
    • http://xabemidet.uniquestationers.com/uploads/1/3/0/7/130739430/taguteg.pdf
    • https://static.usrfiles.com/ugd/b8c837_854749b94cf34baca9ab932ae6fd90a9.pdf
    • https://static.usrfiles.com/ugd/d017d5_9d3084158d3048b68e0198243c30abbb.pdf
    • https://static.usrfiles.com/ugd/0ad6c7_6afa69eadb6647658dd2907d59d86389.pdf
    • https://static.usrfiles.com/ugd/7f16bd_70c25fe4d61446cbbec99c7398e659d9.pdf
    • https://static.usrfiles.com/ugd/f523c3_ba39737bdbcc43bea797bbe0260a4076.pdf
    • https://static.usrfiles.com/ugd/a44510_cce283931d2a4649a9478e4810b4a0f8.pdf
    • https://static.usrfiles.com/ugd/b8c837_13c88426f0d94e63b2eba14d524863fe.pdf
    • https://static.usrfiles.com/ugd/bd5c68_a233a78039f941a38ad6317ada2c96f6.pdf
    • https://static.usrfiles.com/ugd/e1a791_4c6c6f3459074e758f63492cc62761b1.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_off00008774.bin
0699de4673d9a19c4cb59d22de63752ef808c12ead0c8a17f0697c175dc07473		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8774 5612 bytes
font_01_sfnt_off00009a9c.bin
f7eb07ca777faaf6b54ed0941a8cb4751b5716573d636036108a6e450fdd6b70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A9C 11020 bytes

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