Malicious PDF — malware analysis report

Static analysis result for SHA-256 392fb72c46011d49…

MALICIOUS

PDF

53.6 KB Created: 2020-08-05 12:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f30a1af741eb4d8e8a7846a04f72819 SHA-1: 6175da6820450f97285901f4bb8f6bc61e055430 SHA-256: 392fb72c46011d49893c1032602e7b794bad03b5c8d40201860ffb2c1313c7ce
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. This URL is embedded within the document body, disguised as a tutorial. The PDF also exhibits characteristics of a link farm, with numerous external links, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be directing users to malicious infrastructure via the embedded link.

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=spring+batch+tutorial+espa%25C3%25B1ol+pdf
    • http://files.carindalewritersgroup.org/uploads/1/3/0/8/130873708/nokimonolod.pdf
    • http://files.gideasforliving.com/uploads/1/3/2/6/132695258/8123709.pdf
    • http://files.karaikudivoyage.us/uploads/1/3/0/7/130739155/4801484.pdf
    • https://cdn.shopify.com/s/files/1/0433/3495/9256/files/lalekifok.pdf
    • https://cdn.shopify.com/s/files/1/0434/0292/0086/files/discover_biology_5th_edition_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/7346/1669/files/67334606806.pdf
    • https://cdn.shopify.com/s/files/1/0433/8358/6974/files/wifaderemovaduxiwamu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/6219719719.pdf
    • https://cdn.shopify.com/s/files/1/0439/8986/0510/files/agile_interview_questions.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/80278007767.pdf
    • https://cdn.shopify.com/s/files/1/0433/2588/2518/files/46253760435.pdf
    • https://cdn.shopify.com/s/files/1/0429/9456/5271/files/bajamaxuxolemitu.pdf
    • https://cdn.shopify.com/s/files/1/0437/9744/6816/files/sel_dan_organel_sel.pdf
    • https://cdn.shopify.com/s/files/1/0435/3818/6394/files/agriculture_biologique_une_approche_scientifique.pdf
    • https://cdn.shopify.com/s/files/1/0439/3756/2779/files/luvafuvad.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/
    • https://cdn.shopify.com/s/fil

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000082fd.bin
0a77765b33ff5a3edbb0f9dcbd72488013e6242304601744d80b482392f80389		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82FD 5872 bytes
font_01_sfnt_off000096ab.bin
7f88d2acb3de0066c8dd7e4d745ae493eaf3f9984a414b85b22172bff1a4ce24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96AB 15564 bytes

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