Malicious PDF — malware analysis report

Static analysis result for SHA-256 6505d231ede0ca2a…

MALICIOUS

PDF

39.5 KB Created: 2020-07-23 06:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8019ca6eb10f2b151f394cb9c22c7e7e SHA-1: 166634250d5425c0a6fa79c25f7a5f03c27ee98b SHA-256: 6505d231ede0ca2a1d790391333b7e50e9ae9675f05de55c50bf4341de8d2c96
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute content across many sites. The ML classifier strongly flags this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful content.

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.cc/pify?keyword=ave+maria+bach+gounod+pdf
    • http://files.matthewkushi.com/uploads/1/3/0/7/130775331/8584888.pdf
    • http://files.juliaschombergart.com/uploads/1/3/1/6/131606815/gigamulavezosexoma.pdf
    • http://files.ltartsdesign.com/uploads/1/3/2/3/132303269/rugesaxajuku_mupifirod_zuviteboxubiv.pdf
    • http://files.hoxton253.com/uploads/1/3/0/9/130969185/woretugiraw_jafulas_xabomokef.pdf
    • http://files.alexinahicks.com/uploads/1/3/2/6/132695298/4878806.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5857/7046/files/78633740144.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zemeletitofugawekabol.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xekosipavejidowusa.pdf
    • https://cdn.shopify.com/s/files/1/0429/0412/5599/files/36232981214.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37144816260.pdf
    • https://muzovav.files.wordpress.com/2020/07/24265776135.pdf
    • https://zaferogo.files.wordpress.com/2020/06/31066938901.pdf
    • https://nirumepuna.files.wordpress.com/2020/06/risijawaviluzipizafa.pdf
    • https://juwulokoku892427888.files.wordpress.com/2020/06/bekiwomutewixekupoxuzut.pdf
    • https://murivurol.files.wordpress.com/2020/07/8391175606.pdf
    • https://cdn.shopify.com/s/files/1/0430/6337/8081/files/35273254584.pdf
    • https://cdn.shopify.com/s/files/1/0432/2210/6271/files/pogafi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1829/7245/files/mazeke.pdf
    • https://cdn.shopify.com/s/files/1/0434/9755/4084/files/22281873913.pdf
    • https://cdn.shopify.com/s/files/1/0435/9720/1576/files/xogufoxaxosuwarasoval.pdf
    • https://cdn.shopify.com/s/files/1/0431/7180/7381/files/90399689283.pdf
    • https://cdn.shopify.com/s/files/1/0429/7759/1449/files/kisabekarudijunirufazorox.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_off00005cad.bin
167f06e568c8653401db2378bb8b677ceb0bae67d88935c0d186b1094a6f5264		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CAD 5348 bytes
font_01_sfnt_off00006ea5.bin
48a11e8672492979ea4640975c57ffca9a5166f129018542de31914750edcdc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EA5 9988 bytes

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