Malicious PDF — malware analysis report

Static analysis result for SHA-256 fda5969b123d9abf…

MALICIOUS

PDF

38.8 KB Created: 2020-08-10 11:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a376cb91ac3e75687e46977e7a83039f SHA-1: b89b5479c78ff758836e9d569c28016f6196deb1 SHA-256: fda5969b123d9abf89012026d1c407048abfafe55dada9768382ea937c2fe734
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.ru) that is flagged as malicious. The document body, though heavily obfuscated, contains a URL that appears to be the initial lure for users to click on the malicious links. The primary attack pattern involves luring users into clicking links that lead to malicious sites, likely for further exploitation or credential harvesting.

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=baixar+em+pdf+gratis+livro+de+romance
    • http://files.sadhanayama.com/uploads/1/3/0/7/130776016/xuruwanuli-sepajujowij-mufeg-gebubizunesipel.pdf
    • http://files.minesphotography.com/uploads/1/3/1/3/131380005/5075695.pdf
    • http://files.daviddostilioart.com/uploads/1/3/1/3/131398143/tokijukamuziw-rulivi.pdf
    • https://cdn.shopify.com/s/files/1/0429/8260/4963/files/5280334093.pdf
    • https://cdn.shopify.com/s/files/1/0435/8048/9891/files/bejaxosowatosolazuworive.pdf
    • https://cdn.shopify.com/s/files/1/0433/0546/8068/files/21169203726.pdf
    • https://cdn.shopify.com/s/files/1/0435/5407/8883/files/air_pollution_notes_vtu.pdf
    • https://cdn.shopify.com/s/files/1/0444/4350/0710/files/central_park_musso_english.pdf
    • https://cdn.shopify.com/s/files/1/0430/7596/0985/files/php_extract_number_from_string.pdf
    • https://cdn.shopify.com/s/files/1/0431/0594/3701/files/28969718300.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/have_courage_and_be_kind_cinderella_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/4962/3462/files/avon_brochure_june_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/6803/0102/files/stealth_seduction.pdf
    • https://cdn.shopify.com/s/files/1/0428/5267/9836/files/financial_accounting_fundamentals_5th_edition.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_off00005896.bin
5fc48407c6392c96df90a23a8bf49c6424318d380ccc5a952e1b32471921245e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5896 5652 bytes
font_01_sfnt_off00006bcd.bin
e7086aa98f7ece58760a937c6e60a396ce61dae1750ca6de341ebbaa0246ebc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BCD 10096 bytes

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