Malicious PDF — malware analysis report

Static analysis result for SHA-256 88120998f3e2a885…

MALICIOUS

PDF

39.8 KB Created: 2020-08-15 19:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1bb88bd7cde3414e79bd17664e495ec SHA-1: 1245e263aaea754c0049a187fc3a11a9112c1adc SHA-256: 88120998f3e2a885960417c085bc5e660a65529910cf8cd4a3d73b58f256a792
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, which is part of a link farm designed to host numerous other PDFs. The document body and embedded URLs suggest a social engineering lure, prompting the user to download a browser extension or update, which is a common tactic for credential theft or malware installation. The primary malicious URL identified is https://ttraff.ru/wb?keyword=adobe%20acrobat%20pdf%20app%20download, which leads to a collection of other PDF files.

Heuristics 4

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/wb?keyword=adobe%20acrobat%20pdf%20app%20download
    • http://files.dragonfirestore.net/uploads/1/3/0/7/130739253/826469.pdf
    • http://files.realvalueinvestments.net/uploads/1/3/2/6/132681201/3949e.pdf
    • https://cdn.shopify.com/s/files/1/0431/0119/2352/files/anamorphic_illusions.pdf
    • https://cdn.shopify.com/s/files/1/0430/8277/6727/files/81378900658.pdf
    • https://cdn.shopify.com/s/files/1/0437/9164/6880/files/woboganinumakeraja.pdf
    • https://cdn.shopify.com/s/files/1/0428/8082/7558/files/35258702862.pdf
    • https://cdn.shopify.com/s/files/1/0436/5864/1561/files/17917472648.pdf
    • https://cdn.shopify.com/s/files/1/0429/7284/0090/files/gipumilasaboxirutezuz.pdf
    • https://cdn.shopify.com/s/files/1/0433/7300/2902/files/62220281402.pdf
    • https://cdn.shopify.com/s/files/1/0432/3812/9823/files/tobomovojaxakatojirujit.pdf
    • https://cdn.shopify.com/s/files/1/0428/7997/5591/files/volulotof.pdf
    • https://cdn.shopify.com/s/files/1/0448/3943/6449/files/tozenuvuxibinefiba.pdf
    • https://cdn.shopify.com/s/files/1/0439/2353/8088/files/lojuwofiwasokuxoxupixu.pdf
    • https://cdn.shopify.com/s/files/1/0437/9394/0629/files/cbse_answer_sheet_format.pdf
    • https://cdn.shopify.com/s/files/1/0427/7311/9143/files/68665046960.pdf
    • https://cdn.shopify.com/s/files/1/0440/3894/6981/files/horn_of_the_brown_wolf.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_off00005cf7.bin
63d557eb129761e2306d4a9f13945bf47714217535fd820856ad1c7a6ed6cbfd
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CF7 5192 bytes
font_01_sfnt_off00006ebf.bin
471d3c357e351962a798f2258e517abc59ce23e9546fe8ed7b7363ed0f2a51bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EBF 10392 bytes