Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f6bca48756fa211…

MALICIOUS

PDF

41.8 KB Created: 2020-08-26 18:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b7ad48fc5aff38a2c50b72299c691f3 SHA-1: a175e10c7b5e488e705899ca5429380386fe821b SHA-256: 8f6bca48756fa211e4208a7140a8e17c0f2016d482d1c2de2413839d551f8bac
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it points to known malicious infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/pify?keyword=debate+preparation+worksheet, which is presented as a worksheet. This suggests a social engineering attack aiming to trick the user into clicking the malicious link. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, further supporting the malicious intent of redirecting users to external, potentially harmful, sites.

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=debate+preparation+worksheet
    • http://files.athenasavatars.com/uploads/1/3/0/8/130813042/xixesegazilexoba.pdf
    • http://lutisami.satorico.net/uploads/1/3/1/4/131453870/3897049.pdf
    • http://jovizil.analeigh.com.au/uploads/1/3/0/7/130775432/7160587.pdf
    • https://cdn.shopify.com/s/files/1/0430/6308/3170/files/94374940374.pdf
    • https://cdn.shopify.com/s/files/1/0432/9422/8630/files/kogesakedusowa.pdf
    • https://cdn.shopify.com/s/files/1/0428/2816/9382/files/honeywell_bms_system.pdf
    • https://cdn.shopify.com/s/files/1/0435/6354/8833/files/bibosikuxitogomufutatox.pdf
    • https://cdn.shopify.com/s/files/1/0454/1772/6120/files/47522673779.pdf
    • https://cdn.shopify.com/s/files/1/0430/5806/9655/files/fozivolep.pdf
    • https://cdn.shopify.com/s/files/1/0429/2182/0313/files/44352726403.pdf
    • https://cdn.shopify.com/s/files/1/0439/1917/9944/files/beginning_piano_books.pdf
    • https://cdn.shopify.com/s/files/1/0430/2218/8701/files/kiwejadenudusodux.pdf
    • https://cdn.shopify.com/s/files/1/0437/9679/1456/files/28397604485.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_off000064e8.bin
489a636739ca007e90efdceea826d1948d15d6bf0e8c9f259c5a85bf55d0c98d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64E8 5172 bytes
font_01_sfnt_off0000768a.bin
6dee202b3aae589dab35c037bd9b9ee995a8a0969e0222ee15e8fd6219d4025d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x768A 10700 bytes

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