Malicious PDF — malware analysis report

Static analysis result for SHA-256 d112f680dd439322…

MALICIOUS

PDF

64.1 KB Created: 2020-08-18 19:39:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b01ed4a32a945a403f765a5208b32f2a SHA-1: f95999e06259f70fb5a222e6b41afe539616ad5a SHA-256: d112f680dd439322a2aef07f47fa617e4e2f778ffeeecca7a66cfd02a70e122d
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 educational material. The link leads to 'ttraff.ru', which is flagged as malicious infrastructure. The document body, though heavily obfuscated, contains the same malicious URL. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning attempt to distribute the malicious content.

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=printable+inference+worksheets+5th+grade
    • http://sareza.mollydykstra.com/uploads/1/3/0/7/130739789/gizokezu-zarararoz-telipiso.pdf
    • https://cdn.shopify.com/s/files/1/0428/3426/4231/files/44966965142.pdf
    • https://cdn.shopify.com/s/files/1/0428/6359/1590/files/tapitokivadivinus.pdf
    • https://cdn.shopify.com/s/files/1/0428/1060/5735/files/83490273428.pdf
    • https://cdn.shopify.com/s/files/1/0430/6622/8898/files/bivovovuk.pdf
    • https://cdn.shopify.com/s/files/1/0432/9911/1070/files/wusinosagekobifu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1530/6405/files/27203287754.pdf
    • https://cdn.shopify.com/s/files/1/0428/1873/2191/files/lafuvenugekadole.pdf
    • https://cdn.shopify.com/s/files/1/0431/7400/2837/files/13105769578.pdf
    • https://cdn.shopify.com/s/files/1/0440/5959/0806/files/novoselapejesapenano.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_off0000bb17.bin
ab3c0c93ae6a8da39bfe32a04f8420b11e61d0786e4bd7cea8e74136cd110591		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB17 5704 bytes
font_01_sfnt_off0000ce86.bin
c3c58774b5783c742c96444400668cc7b630b7df5d424e0d7e0642fce301002c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE86 10260 bytes

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