Malicious PDF — malware analysis report

Static analysis result for SHA-256 e72d83155e57ba7a…

MALICIOUS

PDF

53.5 KB Created: 2020-08-05 04:25:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c434ee973ba79109f550aaf11fd2a3c1 SHA-1: 0d6d8f4e32e3c1d9ccecf9df456b258a9931f43e SHA-256: e72d83155e57ba7ab8cee619db260a2bf436faa54bf8610ae59993dce54e4030
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass external link farm, with one prominent link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=aflatoxina+b1+pdf', suggesting a lure to a malicious site. The presence of numerous links to external PDFs, many hosted on Shopify, indicates a link farm strategy to potentially improve search engine ranking or distribute malicious content.

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=aflatoxina+b1+pdf
    • http://files.observatoryproject.com/uploads/1/3/1/6/131606815/3180017.pdf
    • http://files.abstractsbysabina.com/uploads/1/3/2/6/132681479/3499eb.pdf
    • http://vuzabi.unityunitedmethodistchurch.org/uploads/1/3/1/4/131453177/fenubej.pdf
    • https://cdn.shopify.com/s/files/1/0429/7015/3113/files/37650723678.pdf
    • https://cdn.shopify.com/s/files/1/0436/1102/9666/files/gopoxitizodebisuniwemiti.pdf
    • https://cdn.shopify.com/s/files/1/0434/0485/3406/files/gakifikujoxusateronitevo.pdf
    • https://cdn.shopify.com/s/files/1/0430/5554/6517/files/42634572311.pdf
    • https://cdn.shopify.com/s/files/1/0428/2603/9452/files/faledowomoribifujipan.pdf
    • https://cdn.shopify.com/s/files/1/0435/6997/1363/files/curso_de_violo_classico.pdf
    • https://cdn.shopify.com/s/files/1/0432/9573/5976/files/adjetivos_posesivos_en_espaol_ejercicios.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/ragako.pdf
    • https://cdn.shopify.com/s/files/1/0436/5670/8254/files/ditotisuz.pdf
    • https://cdn.shopify.com/s/files/1/0437/2103/1832/files/nevaxufupikugevomipipivuz.pdf
    • https://cdn.shopify.com/s/files/1/0431/8127/7348/files/welurin.pdf
    • https://cdn.shopify.com/s/files/1/0431/1715/0368/files/zonivi.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_off00009494.bin
3448b9f4117b9890199a7661435910d52e8bc240a419eb134bd003ca1b7488d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9494 5012 bytes
font_01_sfnt_off0000a5c0.bin
7e1c3da7cb61051fe4d88ebb111f60f541c415804c2448e6b7850420276bd20b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA5C0 10796 bytes

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