Malicious PDF — malware analysis report

Static analysis result for SHA-256 68dc4363fb3d3383…

MALICIOUS

PDF

42.4 KB Created: 2020-09-01 11:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0709ead7a9c0be1c250effbd19c0968f SHA-1: 4a3b3fc606b13174b009beaf27271cb2c33e8ad8 SHA-256: 68dc4363fb3d3383533380048d4e7bda98a5500ff29b32ad5a2819c258aa68fa
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=classes+in+javascript+pdf'. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs, many of which are benign Shopify links, but the primary redirector is suspicious. No scripts were extracted, but the presence of a malicious redirector suggests an attempt to lure the user to a malicious site.

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/pify?keyword=classes+in+javascript+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/4897/6032/files/joe_musgrove_fangraphs.pdf
    • https://cdn.shopify.com/s/files/1/0430/9850/5369/files/revoxanagipok.pdf
    • https://cdn.shopify.com/s/files/1/0429/2725/9811/files/89719839728.pdf
    • https://cdn.shopify.com/s/files/1/0434/0098/6787/files/cv_for_phd_application.pdf
    • https://cdn.shopify.com/s/files/1/0429/9600/7065/files/womaritan.pdf
    • https://cdn.shopify.com/s/files/1/0428/3318/2886/files/grand_bahia_principe_punta_cana_map.pdf
    • https://cdn.shopify.com/s/files/1/0431/5280/1954/files/67912316420.pdf
    • https://static.usrfiles.com/ugd/c345b0_a2596aeb524748ab86f9965774996345.pdf
    • https://static.usrfiles.com/ugd/b8c837_634a8907808144168e47866a18d5b3ea.pdf
    • https://static.usrfiles.com/ugd/69b86f_fd234cd9a0cf4961b5c146e5e4925d60.pdf
    • https://static.usrfiles.com/ugd/b8c837_550b66e1cead48ff8e3451b63a69ed27.pdf
    • https://static.usrfiles.com/ugd/b8c837_9fc565d8a5fe4862abe0ccba70beb78f.pdf
    • https://static.usrfiles.com/ugd/b58d21_8431518e21ab40f691e74fe09f21db4a.pdf
    • https://static.usrfiles.com/ugd/405339_c66549406dfe44ca86072b03822994b1.pdf
    • https://static.usrfiles.com/ugd/4d400c_e1d2303002e7478b9910809fd8fb58b4.pdf
    • https://static.usrfiles.com/ugd/b8c837_bc4e4e942a42478dbac53ec6b2a347ce.pdf
    • https://static.usrfiles.com/ugd/a1fb72_2d268802e7bd4301bc16d4589523dc6c.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006896.bin
a8cd66e1da1dabf8c757855c3e7d3d2bc1a9efeef81046efb85676690df2138f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6896 5188 bytes
font_01_sfnt_off00007a56.bin
27576c83f3d9d3c813e2dcb22691d56614810b56e6648074f7a69bf9671e5a2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A56 10120 bytes

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