Malicious PDF — malware analysis report

Static analysis result for SHA-256 795f9841d77d5b0e…

MALICIOUS

PDF

42.1 KB Created: 2020-09-09 00:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4f93a2ca8ef0aaf57f6298731adea0f SHA-1: ec244dc4000a3f08b6e7b34ba5347695a6adb956 SHA-256: 795f9841d77d5b0e7e9f2b273b9a5765af2c4b05301979b97db811806c66621b
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.me, disguised with a keyword related to "2018 cholesterol guidelines ppt". The document also hosts a large number of external PDF links, many of which point to benign Shopify URLs, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent.

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.me/wix?keyword=2018+cholesterol+guidelines+ppt
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/2707/8052/files/kimixomimaroti.pdf
    • https://cdn.shopify.com/s/files/1/0437/4796/7130/files/19964806351.pdf
    • https://cdn.shopify.com/s/files/1/0435/5738/8437/files/fuxugolajunanudebet.pdf
    • https://static.usrfiles.com/ugd/1f6d71_ca61bcd5c12d4cf295f82aade614951f.pdf
    • https://static.usrfiles.com/ugd/6203b9_fe34524bb3b64c75aec4a5a64022af1e.pdf
    • https://static.usrfiles.com/ugd/36d413_5973e7dd2d4e4d12b8580544e98f5c50.pdf
    • https://static.usrfiles.com/ugd/9c0842_f3b4980af5f84eaba4c40813d6dd7aad.pdf
    • https://static.usrfiles.com/ugd/9b7d8a_c420f0d1e7ea4d3f976260d17388b386.pdf
    • https://cdn.shopify.com/s/files/1/0447/1400/0540/files/adobe_pack_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0437/6346/6391/files/gidukefomakunuv.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_off00006404.bin
57b583fe6b9291ee73afbeaac13bfe31a0d83168081ee36181435bf6acc1127d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6404 5548 bytes
font_01_sfnt_off000076f0.bin
8b0d038752027f30e9e307062c154dd3e6cba431d79a79b72358cd8e58ff575f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76F0 10692 bytes

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