Malicious PDF — malware analysis report

Static analysis result for SHA-256 c949b5b7e4b85845…

MALICIOUS

PDF

39.8 KB Created: 2020-08-02 07:40:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9aa26356bf0e24e7b0b640fae228974c SHA-1: 36e9b20899103da1de2b1e4584abf797cd8b2970 SHA-256: c949b5b7e4b85845f2fb5f03fd54ce3099f6c1540ce41a603424428005f4426d
150 Risk Score

Malware Insights

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

The PDF document contains a malicious redirector link and a large number of embedded links pointing to external PDF files, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness. The primary malicious URL identified is https://ttraff.ru/pify?keyword=callen+thermodynamics+solutions+pdf.

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=callen+thermodynamics+solutions+pdf
    • http://files.gabriela.is/uploads/1/3/2/6/132681698/fuwexubekoli.pdf
    • http://files.lifewithbackpacks.com/uploads/1/3/1/6/131636834/9048451.pdf
    • http://files.crissysimon23.info/uploads/1/3/1/3/131384568/ledoxovito.pdf
    • http://files.alzglassandiron.com/uploads/1/3/2/6/132682564/gadiloxi.pdf
    • http://files.onionmanproductions.com/uploads/1/3/2/7/132710659/6826410.pdf
    • https://cdn.shopify.com/s/files/1/0430/0832/7829/files/pivivelaposorijotopojivoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/6289/4498/files/xivavipofititux.pdf
    • https://cdn.shopify.com/s/files/1/0431/1298/8821/files/7950393062.pdf
    • https://cdn.shopify.com/s/files/1/0433/1244/7652/files/46269713283.pdf
    • https://cdn.shopify.com/s/files/1/0432/6821/0852/files/radelatupobi.pdf
    • https://cdn.shopify.com/s/files/1/0434/9621/0594/files/gumos.pdf
    • https://cdn.shopify.com/s/files/1/0430/7795/9833/files/18722033660.pdf
    • https://cdn.shopify.com/s/files/1/0438/1209/4109/files/ravuzero.pdf
    • https://cdn.shopify.com/s/files/1/0440/4668/0214/files/basic_javascript_counting_cards.pdf
    • https://cdn.shopify.com/s/files/1/0430/7949/9940/files/60789893023.pdf
    • https://cdn.shopify.com/s/files/1/0431/5889/6802/files/stardew_valley_crop_layout.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/3215656586.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_off000058ec.bin
c19721e5cfc83ec1365aeaaa84a5415620cb53877c8a58ca2c76da03f75ebc21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58EC 5404 bytes
font_01_sfnt_off00006b23.bin
395de8e707744df8df18587fd9feb1cb881b151c6f04ac30ae57b3c83db8113b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B23 11900 bytes

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