Malicious PDF — malware analysis report

Static analysis result for SHA-256 2eb51de5baba1a88…

MALICIOUS

PDF

39.8 KB Created: 2020-08-17 05:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a36078dd3512e2d45afc4db2eabab11 SHA-1: a6966b7e036090be22f0084bf012bd6ac6380d3f SHA-256: 2eb51de5baba1a88d51fe72246f0867b58c09bf9414f94784ad8b4a59a6cc696
120 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, many of which point to a link farm hosted on cdn.shopify.com. One of the primary links, however, directs to a known malicious redirector at ttraff.ru. The document body, though heavily obfuscated, contains text related to 'Bruchrechnen' (fraction calculation) and 'Ubungsaufgaben mit Losungen' (practice problems with solutions), suggesting a lure to disguise the malicious intent. The presence of a malicious redirector indicates an attempt to lead the user to a further stage of attack.

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=bruchrechnen+%25C3%25BCbungsaufgaben+mit+l%25C3%25B6sungen+pdf
    • http://files.cwudaytonoh.org/uploads/1/3/1/3/131379553/dubamak.pdf
    • https://cdn.shopify.com/s/files/1/0438/0380/3808/files/gusano_barrenador_del_maiz.pdf
    • https://cdn.shopify.com/s/files/1/0433/3997/2773/files/7446534033.pdf
    • https://cdn.shopify.com/s/files/1/0431/1980/4582/files/57078950621.pdf
    • https://cdn.shopify.com/s/files/1/0439/7416/4638/files/58605403935.pdf
    • https://cdn.shopify.com/s/files/1/0448/3108/0605/files/pathogenesis_of_candida_albicans.pdf
    • https://cdn.shopify.com/s/files/1/0429/3941/6732/files/fivura.pdf
    • https://cdn.shopify.com/s/files/1/0433/0101/1614/files/automobile_engineering_projects_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/6939/0500/files/gonizubebudu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5581/6599/files/vakorewumaronasotobo.pdf
    • https://cdn.shopify.com/s/files/1/0440/4147/0117/files/goleruxepotetaxavurobivi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6299/2799/files/tuxonesuno.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_off0000587e.bin
4265d103776aabbea706bd39ad8b53decbf17d10754af9d25f980e3d19be7b10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x587E 6016 bytes
font_01_sfnt_off00006c4c.bin
20da431043f932c41c95d1eca4e159d1d8a21320f10a7c993ea49a6e5de025de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C4C 10864 bytes

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