Malicious PDF — malware analysis report

Static analysis result for SHA-256 be9436e7c03bde16…

MALICIOUS

PDF

44.3 KB Created: 2020-08-19 07:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2f313f0b8f591a0a2061cf7ece02dfa SHA-1: 798fde8340f227f183c6a5cff9a0c897dbfc9b25 SHA-256: be9436e7c03bde16734a6b206fe7c9328d9fbe9c7c99d4815cd6b53626b17aa5
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=costa+rica+food+guidelines'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links to external PDFs hosted on platforms like Shopify and other domains. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious redirector and a link farm suggests a phishing or SEO poisoning attack designed to lead users to harmful content.

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=costa+rica+food+guidelines
    • http://sijezuvo.hhseyeofthestorm.org/uploads/1/3/0/7/130740218/0759e23eb66d.pdf
    • http://wutajodik.newlifechurchmo.org/uploads/1/3/2/6/132682646/wopelakekofet.pdf
    • http://xekopo.westminsterbible.org/uploads/1/3/1/4/131482975/9087526.pdf
    • https://cdn.shopify.com/s/files/1/0440/8714/8709/files/tovabomef.pdf
    • https://cdn.shopify.com/s/files/1/0428/0346/2303/files/58189786027.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/tupawupabavixafiwabudiruk.pdf
    • https://cdn.shopify.com/s/files/1/0427/6181/4172/files/android_games_room_english.pdf
    • https://cdn.shopify.com/s/files/1/0437/0163/3177/files/pinopowugixovetiwitoro.pdf
    • https://cdn.shopify.com/s/files/1/0433/8260/3927/files/grade_calculator_java.pdf
    • https://cdn.shopify.com/s/files/1/0437/6556/3549/files/fepagoboreputum.pdf
    • https://cdn.shopify.com/s/files/1/0432/8921/5129/files/jegewoporego.pdf
    • https://cdn.shopify.com/s/files/1/0438/2756/0610/files/chicago_manual_of_style_citation_generator.pdf
    • https://cdn.shopify.com/s/files/1/0434/6318/0438/files/halle_berry_monsters_ball.pdf
    • https://cdn.shopify.com/s/files/1/0433/7752/4888/files/dowonolejalujutugexok.pdf
    • https://cdn.shopify.com/s/files/1/0431/5689/7947/files/vetasusuxu.pdf
    • https://cdn.shopify.com/s/files/1/0435/3759/6580/files/84894734084.pdf
    • https://cdn.shopify.com/s/files/1/0429/9482/7415/files/nirigimexajuguk.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_off00006ede.bin
582e1c3c231a22e0fa76373a4c0a88675cb56f279b9d70e4dd5799355707ab30
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EDE 5092 bytes
font_01_sfnt_off00008037.bin
448bf5023904e39ecf92b0097b981a6d04bf2015c12dd40088f820c2c470a4de
pdf-font-stream PDF embedded font (sfnt) at offset 0x8037 10472 bytes