Malicious PDF — malware analysis report

Static analysis result for SHA-256 c896920f58a2b4ca…

MALICIOUS

PDF

40.3 KB Created: 2020-08-20 02:28:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c084fde618b065003cab8f57699b254d SHA-1: 271065fbd46d0ac196b8e5d78d1d2d88c048a2da SHA-256: c896920f58a2b4ca0a577be368d1d7cd53522ad4838978fd7c4671756c95f09e
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://ttraff.ru/pify?keyword=free+addition+coloring+worksheets+for+2nd+grade`. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many pointing to Shopify domains. The document body, though heavily obfuscated, contains the same redirector URL and several other PDF links, suggesting a lure to external malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=free+addition+coloring+worksheets+for+2nd+grade
    • http://files.constructionandtreeservices.com/uploads/1/3/1/4/131453645/mifoz.pdf
    • http://files.sanctuaries.org/uploads/1/3/1/8/131856443/jebegesogitesol.pdf
    • https://cdn.shopify.com/s/files/1/0435/1016/9759/files/bilekakanizojenezinop.pdf
    • https://cdn.shopify.com/s/files/1/0434/9581/7382/files/jaratifulesagamumo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9955/3959/files/18349893660.pdf
    • https://cdn.shopify.com/s/files/1/0429/9315/6259/files/87819182406.pdf
    • https://cdn.shopify.com/s/files/1/0435/5748/6753/files/ti_84_calculator_walmart.pdf
    • https://cdn.shopify.com/s/files/1/0431/5391/6053/files/runigaresuteludaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/1243/1776/files/lijutosagiwololizoga.pdf
    • https://cdn.shopify.com/s/files/1/0430/9018/2304/files/36798564503.pdf
    • https://cdn.shopify.com/s/files/1/0440/1650/0886/files/xexeributuma.pdf
    • https://cdn.shopify.com/s/files/1/0429/0369/9615/files/golesimupifebikoxew.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_off00005eff.bin
66a8808a6b2d60e75c51078efe4f2b68000ad9126af91ace395f972a37a5e5be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EFF 5528 bytes
font_01_sfnt_off000071d9.bin
7f5550b459b7c83ef546991eb93673d310bcab814e15fde9155c7729ecddc2f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71D9 9924 bytes

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