Malicious PDF — malware analysis report

Static analysis result for SHA-256 f325092a7d0829cc…

MALICIOUS

PDF

38.9 KB Created: 2020-08-30 13:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff3191c67e30b476f3d1e3029447c262 SHA-1: 2b33b56d48233e54daab0bc313660f50ed5702c0 SHA-256: f325092a7d0829cc7c9b6969c4ca79970bbe6426efd668d1f913e1213e5c8d9c
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with the primary heuristic identifying a link to a known malicious redirector at 'https://ttraff.ru/wix?keyword=antrenori+fitness+brasov'. Another heuristic indicates a PDF link farm, with the first URL pointing to 'https://cdn.shopify.com/s/files/1/0431/2619/4333/files/35063905623.pdf'. The document body is heavily obfuscated but contains references to the redirector URL. The overall purpose appears to be driving traffic to potentially malicious or spam-related content.

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/wix?keyword=antrenori+fitness+brasov
    • https://cdn.shopify.com/s/files/1/0431/2619/4333/files/35063905623.pdf
    • https://cdn.shopify.com/s/files/1/0430/5013/9801/files/41232286745.pdf
    • https://cdn.shopify.com/s/files/1/0431/9769/4109/files/40245194007.pdf
    • https://cdn.shopify.com/s/files/1/0428/6621/3031/files/binge_eating_disorder_questionnaire.pdf
    • https://cdn.shopify.com/s/files/1/0471/0436/0598/files/lost_omens_character_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/2338/5247/files/16356728398.pdf
    • https://static.usrfiles.com/ugd/b8c837_f41957d4c934435c9073354f6dd72eb5.pdf
    • https://static.usrfiles.com/ugd/b8c837_b361b32ed397438fba0f4d6ea1c31c35.pdf
    • https://static.usrfiles.com/ugd/4e6dd5_f7f69081cc534864be65f354f89de35a.pdf
    • https://cdn.shopify.com/s/files/1/0431/8245/7000/files/gusaxibozagoseribep.pdf
    • https://cdn.shopify.com/s/files/1/0438/6829/1227/files/sifaragalona.pdf
    • https://cdn.shopify.com/s/files/1/0431/1669/1612/files/neon_pink_rgb.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_off00005a0b.bin
3c4fb6eb845901c06142701da34912975d956e371c64d192107720a88509b71f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A0B 4920 bytes
font_01_sfnt_off00006ad7.bin
37d81c9b1567932d8a387ba06743b8b9999c0d7d0dd17960b5dd0530a6b903be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AD7 10144 bytes

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