Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff47e47734eb9ea…

MALICIOUS

PDF

54.9 KB Created: 2020-07-20 20:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6b0ce416122767308014c653aa8537a SHA-1: 8edeb888652fc9585831b08327294f9e6db5914d SHA-256: 4ff47e47734eb9ea9e6aebe32aa19beb20cca935a438c4a4a13eb2920301ea2c
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic identifying a malicious redirector. The primary malicious URL, 'https://ttraff.cc/wb?keyword=delitos%20sexuales%20ecuador%20pdf', is directly linked to known malicious infrastructure. Another heuristic indicates a PDF link farm, suggesting an attempt to manipulate search engine results or distribute content broadly. The ML classifier strongly supports the malicious nature of this PDF.

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/wb?keyword=delitos%20sexuales%20ecuador%20pdf
    • http://files.sierranevadapork.com/uploads/1/3/0/7/130776327/pexilimubibexagasuta.pdf
    • http://files.oakhillsoregon.com/uploads/1/3/1/3/131378868/1390293.pdf
    • http://files.skyhighclubcaligroup.com/uploads/1/3/2/6/132681767/gibapeka_tevuvupomido_wowezevuvu.pdf
    • http://files.alicepyho.com/uploads/1/3/1/8/131856071/a7b3e73461d007.pdf
    • https://cdn.shopify.com/s/files/1/0430/3293/6605/files/27671689198.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4939/files/kojilerafifafokuvipijebor.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/68513135127.pdf
    • https://naxavolode.files.wordpress.com/2020/07/wazekuvunedenefo.pdf
    • https://mubalomisi.files.wordpress.com/2020/07/54183740562.pdf
    • https://sebokufani.files.wordpress.com/2020/06/labefagijegime.pdf
    • https://cdn.shopify.com/s/files/1/0429/1811/7543/files/poditazijopadepovotil.pdf
    • https://cdn.shopify.com/s/files/1/0428/9599/9129/files/26029678290.pdf
    • https://cdn.shopify.com/s/files/1/0430/3834/3322/files/91684203325.pdf
    • https://cdn.shopify.com/s/files/1/0432/4383/1458/files/28787978769.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/5137558887.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mitev.pdf
    • https://cdn.shopify.com/s/files/1/0432/8944/4510/files/90352872286.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/matam.pdf
    • https://cdn.shopify.com/s/files/1/0432/6513/0658/files/rujojixuvelexusufape.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_off00009623.bin
9d695a8c5a7b62256f41cd0e9dd1dab9b823f862aa71e79100f18359f6c25c20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9623 4992 bytes
font_01_sfnt_off0000a73b.bin
b550569f7262bc01b24d150432f107ea80a2ffd498275cd0389b594415251ea7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA73B 11648 bytes

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