Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dc0ba511c893ea2…

MALICIOUS

PDF

37.9 KB Created: 2020-08-14 15:57:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b99d76dfbd8b4eeaba21c7e7f3ab577 SHA-1: 5df1981eced31d737b0e7b072d4d92d753a89675 SHA-256: 4dc0ba511c893ea22075a58ba7f5ef657e30a39c62840710ba3a864140f0aab7
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/pify?keyword=abbreviation+worksheet+for+grade+4'. This URL is embedded within the document body, disguised as an educational worksheet. The PDF also exhibits characteristics of a link farm, with numerous embedded links, many of which point to benign content on Shopify, but the primary malicious link is the clear indicator of compromise. The ML classifier strongly supports the malicious nature of this PDF.

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=abbreviation+worksheet+for+grade+4
    • http://files.fereks.net/uploads/1/3/1/4/131453036/labubitafa.pdf
    • https://cdn.shopify.com/s/files/1/0439/6626/7550/files/algarve_guida_turistica.pdf
    • https://cdn.shopify.com/s/files/1/0431/5434/2042/files/dragnet_theme_song.pdf
    • https://cdn.shopify.com/s/files/1/0429/6228/8793/files/90644657459.pdf
    • https://cdn.shopify.com/s/files/1/0427/8976/5279/files/76843019836.pdf
    • https://cdn.shopify.com/s/files/1/0440/6444/0472/files/buttermere_walk.pdf
    • https://cdn.shopify.com/s/files/1/0434/5636/4711/files/57593740769.pdf
    • https://cdn.shopify.com/s/files/1/0434/7763/1126/files/sibujugoka.pdf
    • https://cdn.shopify.com/s/files/1/0432/7142/2115/files/large_file_test.pdf
    • https://cdn.shopify.com/s/files/1/0431/8865/0135/files/demuloriwozufil.pdf
    • https://cdn.shopify.com/s/files/1/0437/5917/3790/files/a_textbook_of_clinical_pharmacology_and_therapeutics_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/1057/1940/files/sizupirogolop.pdf
    • https://cdn.shopify.com/s/files/1/0436/3629/3785/files/nazazanavesiri.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_off000056d8.bin
8bbd877c4e88114f62e1bf1047024fa5088438de8a9198eb9a09661e6c1ce726		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56D8 5572 bytes
font_01_sfnt_off000069e2.bin
03b1c40a31e0dae052daae60de94d0f5cb4c4a9ef653e7f14b0498979de3a36d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69E2 9768 bytes

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