Malicious PDF — malware analysis report

Static analysis result for SHA-256 250b450808d47e96…

MALICIOUS

PDF

48.9 KB Created: 2020-07-20 05:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a995ebe7510b3b8755b739497cf59284 SHA-1: d0608aea4fedbb7ae077319410fc34ac4ebe5189 SHA-256: 250b450808d47e96898adaaeafed4d93a51c626b31415d97a01ce4d6c796413b
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links to external PDF documents, a technique often used for SEO poisoning to manipulate search engine results. One of the initial links redirects to a known malicious domain, indicating a malicious intent to lure users to harmful content. The ML classifier also strongly flagged this PDF as malicious.

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/wb?keyword=pdf%20alcoholismo%20y%20drogadiccion
    • http://files.coacadeca.org/uploads/1/3/1/3/131383720/7712470.pdf
    • http://files.mrsquam.com/uploads/1/3/0/7/130775987/4777150.pdf
    • http://files.acrossthecreekorganics.ca/uploads/1/3/1/8/131857421/f46fd9d0446a.pdf
    • http://files.gnowangerupcrc.net/uploads/1/3/0/8/130874224/b5faffbfe87491a.pdf
    • http://files.drlizamorton.com/uploads/1/3/0/7/130739459/4508821.pdf
    • http://files.theriver474.com/uploads/1/3/0/9/130968995/lirudupasurino.pdf
    • http://files.synergyfxtotalfitness.com/uploads/1/3/1/4/131453024/0f17c.pdf
    • https://xekavesa.files.wordpress.com/2020/07/19650988777.pdf
    • https://fuxopudox126630495.files.wordpress.com/2020/06/soxamotese.pdf
    • https://bozidaza.files.wordpress.com/2020/06/wozovufufizodubokof.pdf
    • https://korimatubu750764612.files.wordpress.com/2020/07/zemedozakozek.pdf
    • https://milinubed.files.wordpress.com/2020/07/96669559810.pdf
    • https://cdn.shopify.com/s/files/1/0430/7612/4821/files/13116786750.pdf
    • https://cdn.shopify.com/s/files/1/0429/3269/9295/files/8089257882.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57790570823.pdf
    • https://cdn.shopify.com/s/files/1/0428/4320/9895/files/nujoja.pdf
    • https://cdn.shopify.com/s/files/1/0433/4652/6376/files/furowefumonerivevitide.pdf
    • https://cdn.shopify.com/s/files/1/0427/9736/7452/files/98159493295.pdf
    • https://cdn.shopify.com/s/files/1/0435/8373/3915/files/26212554893.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_off000082cc.bin
7041c34086fbf971564f007611585a8a9a725b3345b36e8fd5d0af7de0d67f46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82CC 5128 bytes
font_01_sfnt_off00009404.bin
37e6f5ce917e1f08ea03aab9d7fa5190339c97dadd9e5b524e361cf15a02bad5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9404 10048 bytes

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