Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6669674bc46383d…

MALICIOUS

PDF

43.7 KB Created: 2020-08-21 21:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a52e0fcb9dff225377d2a64fc97148c4 SHA-1: 3b124e055cf57839402db78182b69d1141220eba SHA-256: e6669674bc46383d554f44bc5efb67eafe94036fcb93a1e6a14b4299d4cffc08
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which is also present in the document body. This link leads to a URL that appears to be part of a link farm, aiming to direct users to potentially malicious content. The presence of numerous external PDF links, many hosted on shopify.com, further supports the link farm hypothesis. The ML classifier also flagged this PDF with high confidence.

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.ru/pify?keyword=guided+reading+level+books+search
    • http://tujunov.rothesaylaser.com/uploads/1/3/1/1/131163635/nuriwe.pdf
    • https://cdn.shopify.com/s/files/1/0430/0914/7043/files/sql_joins_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0430/1615/9395/files/encyclopedia_of_modern_bodybuilding_arnold_schwarzenegger.pdf
    • https://cdn.shopify.com/s/files/1/0430/7727/1716/files/eris_free_chat_app.pdf
    • https://cdn.shopify.com/s/files/1/0432/1312/7835/files/lejavorijapede.pdf
    • https://cdn.shopify.com/s/files/1/0438/2674/1405/files/49599018910.pdf
    • https://cdn.shopify.com/s/files/1/0439/9906/8310/files/mofebuso.pdf
    • https://cdn.shopify.com/s/files/1/0431/2789/8268/files/namubunubixusekemufen.pdf
    • https://cdn.shopify.com/s/files/1/0435/3160/0031/files/payson_az_weather.pdf
    • https://cdn.shopify.com/s/files/1/0431/3183/0421/files/herman_melville_bartleby_the_scrivener.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_off00006cab.bin
18e6402ac014963f440de0ec57b4d9648ed2266eda39a51084be80951f062637		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CAB 5496 bytes
font_01_sfnt_off00007f56.bin
397a59fc4e73c5a28e855dd738d7d0770e77ed53822b4988291be06c76d67009		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F56 10260 bytes

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