Malicious PDF — malware analysis report

Static analysis result for SHA-256 d45dfad02a5968c2…

MALICIOUS

PDF

36.0 KB Created: 2020-08-21 17:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b3c3509365798233bb981657b2d21d4 SHA-1: 57592bc03256faeca0f79b479844982ed9093523 SHA-256: d45dfad02a5968c25026887a5c365c20f372fe8daea8fa99f338dee742836b48
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL, https://ttraff.ru/pify?keyword=multivariate+statistical+methods+a+first+course+pdf, is used to redirect users. While many other links point to benign Shopify domains, the presence of the malicious redirector and the ML classifier's high confidence score indicate a malicious intent 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=multivariate+statistical+methods+a+first+course+pdf
    • http://ralitabis.duikinstructeur-thailand.nl/uploads/1/3/1/4/131407089/bikofa.pdf
    • https://cdn.shopify.com/s/files/1/0448/9006/3003/files/wondershare_editor_3._7_0._12_final.pdf
    • https://cdn.shopify.com/s/files/1/0431/9831/6707/files/43381599423.pdf
    • https://cdn.shopify.com/s/files/1/0434/0508/2780/files/kizebisibal.pdf
    • https://cdn.shopify.com/s/files/1/0432/6955/4340/files/learn_brazilian_portuguese_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/4166/8763/files/free_christmas_music_mix.pdf
    • https://cdn.shopify.com/s/files/1/0446/6468/4697/files/chinese_characters_book.pdf
    • https://cdn.shopify.com/s/files/1/0435/1059/5748/files/apa_manual_6th_edition_ebook_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/5453/8658/files/12612636101.pdf
    • https://cdn.shopify.com/s/files/1/0438/3696/5029/files/papagisinufunimelix.pdf
    • https://cdn.shopify.com/s/files/1/0430/4253/7629/files/44560381844.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_off00004e93.bin
591dbdb6b78d521e4a7bd8dc6f1571ffce3f16da5e2585d00b4bf7e7f82bf410		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E93 5460 bytes
font_01_sfnt_off0000610a.bin
02195ebcf33d49af672a1b6c7f28355a378c938d330cfc497965d0b151bf42bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x610A 10012 bytes

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