Malicious PDF — malware analysis report

Static analysis result for SHA-256 a35b42abe80615bb…

MALICIOUS

PDF

44.4 KB Created: 2020-08-12 14:39:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc26bcc5acb817a81cb9d80ffa2ef229 SHA-1: 0d671c8968d274f6715c2137b940565f35fb480e SHA-256: a35b42abe80615bb7b28d2150c0ebee42bfd26d518590d28767d8bb7bca413bd
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 identifying it as a malicious redirector and a link farm. The primary malicious URL, 'https://ttraff.ru/pify?keyword=machine+learning+algorithms+for+prediction+pdf', is designed to lure users by referencing machine learning, while the majority of other links point to benign Shopify domains, likely to obscure the malicious intent. The ML classifier also strongly flagged this PDF as malicious.

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=machine+learning+algorithms+for+prediction+pdf
    • http://files.the5thwick.com/uploads/1/3/0/7/130776728/2c73adcd8363f19.pdf
    • http://files.belovetheartist.com/uploads/1/3/1/6/131636589/wetus.pdf
    • http://files.montanabridalshows.com/uploads/1/3/1/0/131071073/ca14658.pdf
    • https://cdn.shopify.com/s/files/1/0433/3853/0965/files/greek_mythology_comics.pdf
    • https://cdn.shopify.com/s/files/1/0431/4470/8245/files/jafubopowetimifiv.pdf
    • https://cdn.shopify.com/s/files/1/0430/0318/3258/files/musobu.pdf
    • https://cdn.shopify.com/s/files/1/0435/6050/1407/files/idodo_umeh_college_biology.pdf
    • https://cdn.shopify.com/s/files/1/0432/8947/7273/files/sikuzujipisewut.pdf
    • https://cdn.shopify.com/s/files/1/0430/9437/6605/files/nutowo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9222/9787/files/82763756762.pdf
    • https://cdn.shopify.com/s/files/1/0433/0491/1006/files/juwuvunelafi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/71261929940.pdf
    • https://cdn.shopify.com/s/files/1/0435/4542/8122/files/74344185916.pdf
    • https://cdn.shopify.com/s/files/1/0428/0100/4707/files/davemuvotorukofijix.pdf
    • https://cdn.shopify.com/s/files/1/0430/8929/7568/files/94582740508.pdf
    • https://cdn.shopify.com/s/files/1/0437/4154/4599/files/93424419235.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_off00006f75.bin
c0c7b1f680301076c881049df16e694b85903c63e18cda31eb81b642e51168ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F75 5572 bytes
font_01_sfnt_off00008236.bin
d898a4ec970fc18fd3839a0de7f7c80cd5218ed375e16b24ae724621f16977c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8236 10180 bytes

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