Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d499a5d05d7985e…

MALICIOUS

PDF

40.7 KB Created: 2020-08-12 04:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25f02f53b958f9cb8e3e3faf33157abd SHA-1: c9d0dbe947af7297eea1548f3eaff903b2240b02 SHA-256: 9d499a5d05d7985e9beffa8730c1e1147faf6490669557a46d997340c8628085
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a document about clinical examination skills. The link, 'https://ttraff.com/pify?keyword=clinical+examination+skills+for+healthcare+professionals+pdf', is designed to lead users to further malicious content. The PDF also functions as a link farm, pointing to numerous other PDFs hosted on various domains, many of which are likely part of the same distribution network.

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=clinical+examination+skills+for+healthcare+professionals+pdf
    • http://files.interiormotivesconsignment.com/uploads/1/3/1/3/131398125/4523180.pdf
    • http://lunomow.centrallouisianaorchidsociety.org/uploads/1/3/2/8/132814930/nekalepufivikumumin.pdf
    • http://files.salmochildrenscentre.net/uploads/1/3/2/6/132696210/bf0335d4878.pdf
    • http://files.sfidinc.com/uploads/1/3/0/7/130776158/bedujumerad_tafis_vavewedalogisad_zumuruwuladu.pdf
    • https://cdn.shopify.com/s/files/1/0435/6807/0824/files/donofipeneritirase.pdf
    • https://cdn.shopify.com/s/files/1/0434/6403/2421/files/77649471357.pdf
    • https://cdn.shopify.com/s/files/1/0428/5543/2348/files/fejefitelunutat.pdf
    • https://cdn.shopify.com/s/files/1/0432/9707/9460/files/86782987685.pdf
    • https://cdn.shopify.com/s/files/1/0430/4994/3202/files/28204092395.pdf
    • https://cdn.shopify.com/s/files/1/0439/4965/4184/files/10813645888.pdf
    • https://cdn.shopify.com/s/files/1/0436/4196/2649/files/ripugakodiwulolelu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0930/9854/files/fameluduponuweti.pdf
    • https://cdn.shopify.com/s/files/1/0431/0827/0244/files/ammonia_vapour_absorption_refrigeration_system.pdf
    • https://cdn.shopify.com/s/files/1/0440/9376/7832/files/99_names_of_allah_calligraphy.pdf
    • https://cdn.shopify.com/s/files/1/0430/5184/3737/files/30927833754.pdf
    • https://cdn.shopify.com/s/files/1/0433/8260/3927/files/50670505814.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_off00006061.bin
a5445867d7a21586109d0760d4f90f72feba2c3b2513fe9036587e012b9a4f7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6061 5432 bytes
font_01_sfnt_off000072a6.bin
ae8f10c65e7dcb3c8f1f1f9820df932ba5f3a6a8759c50d65e6ca2f5ac0cce02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72A6 10076 bytes

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