Malicious PDF — malware analysis report

Static analysis result for SHA-256 8da57ad39060b979…

MALICIOUS

PDF

42.2 KB Created: 2020-08-31 17:59:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e12fd5ce97627a834d767a099ff753b3 SHA-1: b6c5a5eed1519c81189c76bfd1cf4af39dc3c3d4 SHA-256: 8da57ad39060b979eb9a3a9ba8fd6e667e762565dbe642446d39e5a631f1cad3
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. This URL is presented in the document body, disguised as a link for 'Activex for internet explorer'. The PDF also contains a large number of external links, many hosted on Shopify, which is indicative of a link farm used for SEO poisoning or to obscure malicious destinations. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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/wix?keyword=activex++for+internet+explorer
    • https://cdn.shopify.com/s/files/1/0436/5778/9605/files/visut.pdf
    • https://cdn.shopify.com/s/files/1/0431/4575/6833/files/26672795191.pdf
    • https://cdn.shopify.com/s/files/1/0438/5662/5829/files/google_adwords_certification_fundamentals.pdf
    • https://cdn.shopify.com/s/files/1/0429/0802/4985/files/2189111761.pdf
    • https://cdn.shopify.com/s/files/1/0428/6365/7119/files/giloge.pdf
    • https://cdn.shopify.com/s/files/1/0430/2385/9873/files/lurudiwevixokilula.pdf
    • https://cdn.shopify.com/s/files/1/0434/0200/2595/files/10083181690.pdf
    • https://cdn.shopify.com/s/files/1/0438/6160/6550/files/song_achyutam_keshavam_by_shreya_ghoshal.pdf
    • https://cdn.shopify.com/s/files/1/0431/6240/2967/files/calling_you_bagdad_cafe.pdf
    • https://cdn.shopify.com/s/files/1/0433/2421/1354/files/zirokabarur.pdf
    • https://static.usrfiles.com/ugd/764aaa_d718ad30ee2f4572a1c27ac1182fcaba.pdf
    • https://static.usrfiles.com/ugd/f4de5e_94ab2f05bbce4c42ae6a85657583235f.pdf
    • https://static.usrfiles.com/ugd/a48928_b6257e5f5ea840fcb36e9b1e40c74032.pdf
    • https://static.usrfiles.com/ugd/5fd5c1_1023b38a1edb47f5b25765cb7bc7af24.pdf
    • https://static.usrfiles.com/ugd/6c98bc_9f0165e32d71494a86ea8b2bb172f033.pdf
    • https://static.usrfiles.com/ugd/de3d83_f84730ec26064607ac9404207191797f.pdf
    • https://static.usrfiles.com/ugd/b7ed05_ef3f85d74dbf4a7e89a35c4fb329ed6d.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_off00006710.bin
8212e4e1cad26248d5ec0c20fbfa50f2f1364d0824f542ad1660edb4a80bf243		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6710 4736 bytes
font_01_sfnt_off00007752.bin
b7ed457befcac241559c9643345862f2a5cdecd0eb4d774afa4ec87792560bc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7752 10648 bytes

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