Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd5b21d3b2bd917c…

MALICIOUS

PDF

39.7 KB Created: 2020-08-11 14:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6656be2cc3ed5d62d9d5c96b094687d8 SHA-1: 6a2c4c7543239b99626b43ea5f2d0c8a25fbbdfa SHA-256: bd5b21d3b2bd917c195d3f7f376180c84ee8519279e4c2e4817a09ff6d74aaed
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to Shopify domains but are likely part of a link farm designed to obscure the primary malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags the URL https://ttraff.ru/pify?keyword=brihaspati+dev+vrat+katha+pdf as malicious. The document body, though partially corrupted, suggests a lure related to 'Brihaspati dev vrat katha pdf'. The numerous links likely serve to distribute traffic and evade detection, ultimately leading to the malicious redirector.

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=brihaspati+dev+vrat+katha+pdf
    • http://files.strtsmrtbrnd.com/uploads/1/3/0/9/130968984/deponukoz.pdf
    • http://files.bloodsugarbikemagic.com/uploads/1/3/2/8/132814958/6480127.pdf
    • http://files.vlmpto.org/uploads/1/3/0/7/130739510/9304533.pdf
    • https://cdn.shopify.com/s/files/1/0434/1966/4540/files/63790695092.pdf
    • https://cdn.shopify.com/s/files/1/0429/6278/0311/files/zoxux.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4885/files/xojepopemaboj.pdf
    • https://cdn.shopify.com/s/files/1/0431/7931/1253/files/12022661832.pdf
    • https://cdn.shopify.com/s/files/1/0432/3724/5086/files/xasuxasopadava.pdf
    • https://cdn.shopify.com/s/files/1/0433/4757/4943/files/manual_apa_version_6_2020.pdf
    • https://cdn.shopify.com/s/files/1/0440/7063/3624/files/xarifixukiferan.pdf
    • https://cdn.shopify.com/s/files/1/0431/8121/1810/files/6353863166.pdf
    • https://cdn.shopify.com/s/files/1/0434/3614/6855/files/vizosogupezodukobi.pdf
    • https://cdn.shopify.com/s/files/1/0430/5692/2778/files/fumodesisa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000521f.bin
74150a7c19f87443af5857ad0f052bd63cc5513954e98018ffb7deb6a300e661		 pdf-font-stream PDF embedded font (sfnt) at offset 0x521F 4840 bytes
font_01_sfnt_off000062a9.bin
d50972f9abc6f8cb57b5a70e9bf271ad83f4979788ae4649dfb86eee5a06cc20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62A9 9732 bytes
font_02_sfnt_off000083fe.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83FE 4324 bytes

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