Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9dec5f6aac02e90…

MALICIOUS

PDF

44.8 KB Created: 2020-08-20 20:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b2be64d087572951f1ff62a0c0ac326 SHA-1: 311309a33bdb2f6ff92f21b2cd8e472d341f4f3e SHA-256: b9dec5f6aac02e901b6de4ff38be97fc90ab4a7f8e855b8ff6d2d445add1ede3
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/pify?keyword=get+twitter+account+information'. Additionally, it features a large number of external PDF links, many hosted on Shopify, suggesting a link farm for SEO manipulation or traffic redirection. The ML classifier also strongly indicated maliciousness. The document body contains text related to 'Get twitter account information', aligning with the redirector's purpose.

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=get+twitter+account+information
    • http://nadanije.coburnsandandgravel.com.au/uploads/1/3/2/7/132740214/lakekozijifitagotev.pdf
    • http://files.sachagrosselart.com/uploads/1/3/0/9/130969209/belizifimekedaxuwuzu.pdf
    • http://files.citybeadschicago.com/uploads/1/3/0/7/130739831/a8c13225b.pdf
    • http://kexarus.onelightinstitute.org/uploads/1/3/1/3/131398539/fawaxamunazik-difar-zefuwununidugom.pdf
    • http://files.meltonscarpet.com/uploads/1/3/0/8/130874295/207650.pdf
    • https://cdn.shopify.com/s/files/1/0430/4994/3202/files/11552801710.pdf
    • https://cdn.shopify.com/s/files/1/0433/9764/4444/files/refasokesede.pdf
    • https://cdn.shopify.com/s/files/1/0432/7908/9824/files/guia_medico_unimed_araguaina.pdf
    • https://cdn.shopify.com/s/files/1/0432/2131/9839/files/18536275924.pdf
    • https://cdn.shopify.com/s/files/1/0437/5045/7505/files/formation_avec_les_animaux_en_suisse.pdf
    • https://cdn.shopify.com/s/files/1/0429/3882/6918/files/77712588982.pdf
    • https://cdn.shopify.com/s/files/1/0439/5764/9566/files/62965172438.pdf
    • https://cdn.shopify.com/s/files/1/0436/5726/5305/files/92597467120.pdf
    • https://cdn.shopify.com/s/files/1/0430/1645/4305/files/xanodezopelagutujozuzi.pdf
    • https://cdn.shopify.com/s/files/1/0434/3467/2294/files/formal_letter_example_for_students.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_off00006514.bin
38423e164761384227f9d6dc18e6e3326a9389c377f05529a7e18bc2e3c373bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6514 4820 bytes
font_01_sfnt_off00007571.bin
d962787c993a99218659ea508945da73ca6745ab8eb4b9ae7a1deae6a9de7d2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7571 10252 bytes
font_02_sfnt_off00009870.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9870 4324 bytes

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