Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dfd237fe0a4eab7…

MALICIOUS

PDF

169.8 KB Created: 2020-08-31 14:41:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 352c3c2ed1f4c4febf8ed0795bc084c0 SHA-1: 6e3c7a0e925e6c423fd5a1bd0184f80efc810b54 SHA-256: 4dfd237fe0a4eab7487a2e8cd1fecdc665954a00a4edfe7509f9b4e681d40e5c
92 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector infrastructure, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The embedded URL, 'https://ttraff.club/wix?keyword=gastroenterology+guidelines+canada', is presented to the user as a lure for 'Gastroenterology guidelines canada'. The ML classifier also strongly indicated maliciousness. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • 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.club/wix?keyword=gastroenterology+guidelines+canada
    • https://cdn.shopify.com/s/files/1/0440/0414/7350/files/how_to_find_frequency_in_excel_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/7410/1149/files/tapumorigemezitojit.pdf
    • https://cdn.shopify.com/s/files/1/0432/8269/4312/files/31588958721.pdf
    • https://cdn.shopify.com/s/files/1/0435/4280/6680/files/82694959390.pdf
    • https://cdn.shopify.com/s/files/1/0433/4570/7166/files/94019776060.pdf
    • https://cdn.shopify.com/s/files/1/0434/6052/6246/files/honda_gcv190_carburetor.pdf
    • https://cdn.shopify.com/s/files/1/0432/5172/8546/files/4665177819.pdf
    • https://cdn.shopify.com/s/files/1/0434/0688/5027/files/nalav.pdf
    • https://static.usrfiles.com/ugd/576447_a0edbf597140485f8ef178f728634da1.pdf
    • https://static.usrfiles.com/ugd/b8c837_bf36f6b73d654dffb9ad9e1c2509dd58.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/39720928980.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/small_add_signature.pdf
    • https://cdn.shopify.com/s/files/1/0428/0313/4627/files/90550145785.pdf
    • https://cdn.shopify.com/s/files/1/0432/0896/6301/files/6151792864.pdf
    • https://cdn.shopify.com/s/files/1/0431/1692/0994/files/29971411645.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000247e8.bin
1b4e57fbf73e12f4545508f2151825379816320338b91b777d5511ba221f69f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x247E8 5120 bytes
font_01_sfnt_off00025967.bin
d354e0ad093c577f1b533732e1a8f75ccda561c709cf74b95353f14f19c9d711
pdf-font-stream PDF embedded font (sfnt) at offset 0x25967 16036 bytes
font_02_sfnt_off00028b8f.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x28B8F 4324 bytes