Malicious PDF — malware analysis report

Static analysis result for SHA-256 db3485865e2d9813…

MALICIOUS

PDF

46.5 KB Created: 2020-08-20 07:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 343fba28d9b411c9a2249f27f1a5df36 SHA-1: 3d5b7a81be4aa6c52a61be9578565255cc9e150b SHA-256: db3485865e2d98131c7cc579bb68076daaf39972d263ba956e834008da0cf064
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to its extensive use of external links, specifically a link farm hosted on Shopify and a redirector URL on ttraff.com. The document body contains the redirector URL, suggesting it's intended to lure users to malicious content. The ML classifier strongly supports the malicious verdict.

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.com/pify?keyword=thyrotoxicosis+treatment+guidelines
    • http://files.pickleandwink.com/uploads/1/3/2/6/132681456/vizovej-zagonaropubumi.pdf
    • http://files.justjumpkaty.com/uploads/1/3/1/8/131872087/gebanikedumuvusosim.pdf
    • http://xukaz.wearehopecommunity.com/uploads/1/3/1/1/131164243/3169459.pdf
    • https://cdn.shopify.com/s/files/1/0433/8886/2614/files/xebagirofa.pdf
    • https://cdn.shopify.com/s/files/1/0429/6713/8470/files/anatomy_and_physiology_of_small_intestine.pdf
    • https://cdn.shopify.com/s/files/1/0433/7221/6483/files/5317707224.pdf
    • https://cdn.shopify.com/s/files/1/0435/1436/4059/files/ritofutodolebunuxopuro.pdf
    • https://cdn.shopify.com/s/files/1/0430/1167/0179/files/jugexazutokoriruzogoraki.pdf
    • https://cdn.shopify.com/s/files/1/0433/8368/5270/files/22450279310.pdf
    • https://cdn.shopify.com/s/files/1/0434/3463/9522/files/requirements_prioritization_matrix_template.pdf
    • https://cdn.shopify.com/s/files/1/0430/9463/8749/files/kufazixa.pdf
    • https://cdn.shopify.com/s/files/1/0436/1102/9667/files/houghton_mifflin_math_grade_3_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0433/7877/0076/files/76884772022.pdf
    • https://cdn.shopify.com/s/files/1/0429/9282/8579/files/76023111415.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/
    • https://cdn.shopify.com/s/files/1/0433/7221/6483/files/5317707224

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000076eb.bin
1fe9f1cb00fe308186f21f1fe1e2f188f12bfc5b6301e679c137ca96d3b280bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x76EB 5472 bytes
font_01_sfnt_off00008968.bin
016f89f5f88f977a3e1806a81297afb09b0595c027e3b4748a69c95f97b9dfc6
pdf-font-stream PDF embedded font (sfnt) at offset 0x8968 10332 bytes