Malicious PDF — malware analysis report

Static analysis result for SHA-256 9add714c63d6b579…

MALICIOUS

PDF

36.3 KB Created: 2020-08-21 13:39:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7768ce60e7819a6207daeaf70d6b2b9 SHA-1: 1b8e36c8e2fc15e93c488ecc38c99f650d7bf56b SHA-256: 9add714c63d6b5797ea69dfe2e41612cf8206a33182627be84189f7dd5b0cbec
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=modeling+linear+inequalities+worksheet+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links to external PDFs, some of which are hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same malicious URL and other PDF links, suggesting a lure to external 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=modeling+linear+inequalities+worksheet+pdf
    • http://files.enakosovac.com/uploads/1/3/0/7/130739275/61442ae02cac69.pdf
    • http://files.ninelivestwine.com/uploads/1/3/0/8/130874629/vezik_gunefitotokek.pdf
    • http://files.smashsomethingtulsa.com/uploads/1/3/2/6/132682676/reremagiw.pdf
    • https://cdn.shopify.com/s/files/1/0432/8960/8360/files/palitenizomo.pdf
    • https://cdn.shopify.com/s/files/1/0432/5788/8936/files/deduce_crossword_answer.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/71212028188.pdf
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/after_the_love_has_gone_lead_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0429/7628/0729/files/97852664972.pdf
    • https://cdn.shopify.com/s/files/1/0439/3605/5454/files/fallout_new_vegas_stutter_remover.pdf
    • https://cdn.shopify.com/s/files/1/0434/1923/8562/files/wikejasovoketukajoraxir.pdf
    • https://cdn.shopify.com/s/files/1/0434/9670/2104/files/58674821450.pdf
    • https://cdn.shopify.com/s/files/1/0438/6498/1664/files/cbec_gst_act.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_off00004f66.bin
6b7c4a6f0410e8a7eb9070dc4f27208dc702c35379b7ca94f5bebd2fe6b1ea35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F66 5592 bytes
font_01_sfnt_off0000627c.bin
e0896f86fd5a66e06fc4c37e6fe50689f43bf47ec4957f1fd2078fe8c8291168		 pdf-font-stream PDF embedded font (sfnt) at offset 0x627C 9948 bytes

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