Malicious PDF — malware analysis report

Static analysis result for SHA-256 a223f4e2f3d63457…

MALICIOUS

PDF

45.8 KB Created: 2020-08-12 06:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a195f44dfdccea04718c53d7355ddbfc SHA-1: 7a898ec9c88ebe3f46d45fad61ac717b09b7a530 SHA-256: a223f4e2f3d63457e5aa2ebf67ad9b1c060030e3c260cab7e30755350da36739
150 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is designed to lure users to malicious content. The document body, though heavily obfuscated, contains this URL and other links to PDF files hosted on various domains, suggesting a link farm or redirection scheme. The ML classifier also strongly indicated maliciousness.

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=impact+of+after+sales+service+on+customer+satisfaction+pdf
    • http://files.thebluenoteringos.com/uploads/1/3/2/6/132696067/vizas-jawowor-fulewiriweb-gunufatuf.pdf
    • http://files.birminghamyouththeatre.co.uk/uploads/1/3/2/7/132710783/vuvazuzixife_bofedalonuf.pdf
    • http://files.colangelowine.com/uploads/1/3/0/7/130740357/8805950.pdf
    • http://files.greenhopefinearts.org/uploads/1/3/0/8/130874257/1881066.pdf
    • https://cdn.shopify.com/s/files/1/0433/0913/8084/files/1650008466.pdf
    • https://cdn.shopify.com/s/files/1/0431/5018/0503/files/angularjs_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8758/files/zavibip.pdf
    • https://cdn.shopify.com/s/files/1/0438/3395/0358/files/gifoxe.pdf
    • https://cdn.shopify.com/s/files/1/0432/8692/1376/files/42151099924.pdf
    • https://cdn.shopify.com/s/files/1/0438/2670/8637/files/chhaya_prakashani_math_books_for_class_11_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/0988/4838/files/55356642544.pdf
    • https://cdn.shopify.com/s/files/1/0433/9191/0038/files/2017451321.pdf
    • https://cdn.shopify.com/s/files/1/0433/9800/4899/files/vosorulukasujusekamep.pdf
    • https://cdn.shopify.com/s/files/1/0433/4845/9675/files/rabiz.pdf
    • https://cdn.shopify.com/s/files/1/0431/7141/4173/files/89311696224.pdf
    • https://cdn.shopify.com/s/files/1/0432/3721/2319/files/budget_2020_sri_lanka_highlights.pdf
    • https://cdn.shopify.com/s/files/1/0431/8307/9592/files/35254067174.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_off0000730f.bin
e00e17ba8d96c3b8aff37a9ca56b5aab6e1fa50a9479bbb95afbed3d8675dcee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x730F 5300 bytes
font_01_sfnt_off000084f6.bin
46f1c0a2b006374574693ad590c6193b3865139cea88c80f8bcac0c1cd751bd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84F6 10684 bytes

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