Malicious PDF — malware analysis report

Static analysis result for SHA-256 d24982cff82f2249…

MALICIOUS

PDF

48.4 KB Created: 2020-08-09 11:24:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d7e14e60211b376d4a5a3a6ee39edc6 SHA-1: 4c94ddaca4f46ecd76ec380a0e90642006b8013f SHA-256: d24982cff82f2249debb3e5fa87a78e67e50f5019007c94050c3c27204720e2f
152 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious and contains a large number of embedded links, many of which point to external PDF files. One of these links, 'https://ttraff.com/pify?keyword=liste+aliments+avec+gluten+pdf', is identified as a known malicious redirector. The document body contains garbled text along with some of the URLs, suggesting an attempt to disguise the malicious nature of the content. The primary attack pattern appears to be a link farm designed to either manipulate search engine results or redirect users to malicious sites.

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=liste+aliments+avec+gluten+pdf
    • http://files.warwickmixedhockey.com/uploads/1/3/0/8/130813577/6dc9ff.pdf
    • http://files.cejdentalaccountants.co.uk/uploads/1/3/1/4/131436956/runokunivilejaxinabe.pdf
    • http://nudutez.annapike.co.uk/uploads/1/3/1/3/131380600/bexajowubufa_gimemumed_susufolub.pdf
    • http://files.stmattsschoolcampbellsport.com/uploads/1/3/2/3/132303001/a9ea8f5910957e.pdf
    • https://cdn.shopify.com/s/files/1/0434/9027/9574/files/tinasalagipe.pdf
    • https://cdn.shopify.com/s/files/1/0439/4831/0683/files/95537346187.pdf
    • https://cdn.shopify.com/s/files/1/0431/6240/2965/files/best_free_reader_linux.pdf
    • https://cdn.shopify.com/s/files/1/0430/7533/8391/files/24048955878.pdf
    • https://cdn.shopify.com/s/files/1/0428/1440/6823/files/95451415543.pdf
    • https://cdn.shopify.com/s/files/1/0428/8118/8003/files/72444005286.pdf
    • https://cdn.shopify.com/s/files/1/0437/1503/5288/files/introduction_to_electric_circuits_9th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0437/7165/8389/files/robasepapuzes.pdf
    • https://cdn.shopify.com/s/files/1/0437/7313/2957/files/learn_japanese_language_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/8627/4977/files/critical_thinking_definition.pdf
    • https://cdn.shopify.com/s/files/1/0429/4279/1839/files/befikobujivowo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7182/3262/files/30657990164.pdf
    • https://cdn.shopify.com/s/files/1/0437/0900/5978/files/39535144967.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_off000075ac.bin
363dc2ad21387bec331624bf0c413750f0979e9b80d116794cf51bb3caa74715		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75AC 5380 bytes
font_01_sfnt_off000087fa.bin
cef11b978fb7b11db68325db5839999cb53a3c23027a2776a3041df3fcf2129d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87FA 14580 bytes

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