Malicious PDF — malware analysis report

Static analysis result for SHA-256 282642345e33cbef…

MALICIOUS

PDF

32.2 KB Created: 2020-08-01 13:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c2c4223b571df09f96ff07dbcf726e4 SHA-1: e5dea48f25bb646c2fcda858042bb00f31a28845 SHA-256: 282642345e33cbef3d4393cfc149a85e3624243be20d2a4279139919bb9d6e38
120 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure related to 'CBT nuggets torrent' and the primary malicious URL. The file also exhibits characteristics of a link farm, with numerous links pointing to external PDF files, likely to manipulate search engine results.

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=cbt+nuggets+torrent
    • http://files.parrellohara.com/uploads/1/3/0/8/130814346/bupugefabalap-xewoduwunexajug-fuzuretijes.pdf
    • http://files.meadowlynnfarms.com/uploads/1/3/1/6/131606563/bepebenud.pdf
    • http://files.davisvilledetailing.com/uploads/1/3/2/6/132681336/fomek.pdf
    • https://cdn.shopify.com/s/files/1/0428/3177/3852/files/mosiv.pdf
    • https://cdn.shopify.com/s/files/1/0431/7901/6349/files/hockenbury_psychology_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/0591/0933/files/birivifulesizuxilisovazej.pdf
    • https://cdn.shopify.com/s/files/1/0433/1785/4373/files/fepureze.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/12201738232.pdf
    • https://cdn.shopify.com/s/files/1/0435/1184/0927/files/rimunelix.pdf
    • https://cdn.shopify.com/s/files/1/0433/5498/0505/files/98075896601.pdf
    • https://cdn.shopify.com/s/files/1/0431/1708/4833/files/initialize_arraylist_java.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/67062005494.pdf
    • https://cdn.shopify.com/s/files/1/0435/2966/6724/files/14527968902.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_off000043a5.bin
ed7d61fed7bf5a611f65a66137fba31de6680fb36f44f722d370c277429d7018		 pdf-font-stream PDF embedded font (sfnt) at offset 0x43A5 4656 bytes
font_01_sfnt_off0000538a.bin
ad66eb5dfa396c1539c8a934c0687151642e2c082bb6354e3b28317acf17256c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x538A 9564 bytes

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