Malicious PDF — malware analysis report

Static analysis result for SHA-256 25338ae582a05949…

MALICIOUS

PDF

42.7 KB Created: 2020-08-21 11:40:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03b35c5d8e61078ebf209aa791190a29 SHA-1: 604abf64ffd92e4186694db223aa2fca3ccd2d9f SHA-256: 25338ae582a05949c4048bed8a065f0eef85d04f391aaaffa9a0cba6f1d15cd2
150 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to a high ML classifier score and the presence of a large number of embedded links. One critical heuristic indicates the PDF links to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=vidmate+old+2017+apk'. Another critical heuristic flagged it as a PDF SEO link farm, with numerous links pointing to external PDFs hosted on Shopify, suggesting an attempt to manipulate search engine results. The document body contains garbled text but includes the same malicious URL and several benign Shopify URLs.

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=vidmate+old+2017+apk
    • http://tijiw.science1helpsite.com/uploads/1/3/2/7/132710657/tigewelifunitunixuma.pdf
    • http://zamuru.kansasgiftededucationdatabase.com/uploads/1/3/0/7/130775027/dodamarudaguxifegob.pdf
    • http://nuvegoneb.metropolitanchristianbibleinstitute.com/uploads/1/3/2/8/132815961/d849f7ea.pdf
    • https://cdn.shopify.com/s/files/1/0434/7019/2802/files/54256907049.pdf
    • https://cdn.shopify.com/s/files/1/0430/2408/9242/files/jiwovipudazabiwavi.pdf
    • https://cdn.shopify.com/s/files/1/0430/9912/7957/files/catalogue_daikin_air_eau_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/2812/7650/files/tunarebirezasobodixipep.pdf
    • https://cdn.shopify.com/s/files/1/0428/5543/2348/files/fejefitelunutat.pdf
    • https://cdn.shopify.com/s/files/1/0431/4729/6922/files/69251039725.pdf
    • https://cdn.shopify.com/s/files/1/0432/0270/7616/files/71398711623.pdf
    • https://cdn.shopify.com/s/files/1/0428/5261/4311/files/baby_shark_sheet_music_alto_sax.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/6565103434.pdf
    • https://cdn.shopify.com/s/files/1/0439/1688/6184/files/legagesuvamok.pdf
    • https://cdn.shopify.com/s/files/1/0437/7165/8392/files/82367003616.pdf
    • https://cdn.shopify.com/s/files/1/0429/1356/2787/files/dilodudufoxofefetajuba.pdf
    • https://cdn.shopify.com/s/files/1/0435/7862/2111/files/1130749765.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_off00006911.bin
08c1b6d9873b329a9dd39783e15b9e49d1553454a63b495127fe0bafc92637c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x6911 5268 bytes
font_01_sfnt_off00007afe.bin
5c15e2d68d2541d486684e6332d4a75c526a0bc20a67be816fbf5adb3e51af07
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AFE 10268 bytes