Malicious PDF — malware analysis report

Static analysis result for SHA-256 be77999d27a3623e…

MALICIOUS

PDF

41.6 KB Created: 2020-08-26 23:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8561415fb93f0df807dd828d20c59a1 SHA-1: 4ddf00baccedc7e18280d829bc4a8e5612c72ef5 SHA-256: be77999d27a3623ef3a72e6c977f4a570a19a3dc045bc7f9b9e34f95808329c0
154 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, many pointing to PDF files hosted on Shopify. One critical heuristic indicates a malicious redirector link to 'ttraff.ru', suggesting a malicious intent behind the link farm. The ML classifier also strongly flagged this PDF as malicious. The document body contains garbled text but includes the URL 'https://ttraff.ru/pify?keyword=tout+ce+qu%252527+il+voudra+pdf', reinforcing the malicious redirector finding.

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.ru/pify?keyword=tout+ce+qu%252527+il+voudra+pdf
    • http://files.addysbooknook.com/uploads/1/3/2/7/132712129/pirigasopuwigido.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/buxidumex.pdf
    • https://cdn.shopify.com/s/files/1/0432/0880/2468/files/xekuros.pdf
    • https://cdn.shopify.com/s/files/1/0433/3531/9711/files/voluw.pdf
    • https://cdn.shopify.com/s/files/1/0433/5281/7832/files/mokewinatupakatipetuzani.pdf
    • https://cdn.shopify.com/s/files/1/0435/5765/0584/files/bonefish_grill_menu_prices.pdf
    • https://cdn.shopify.com/s/files/1/0428/9619/5737/files/fufameziwateduxutixo.pdf
    • https://cdn.shopify.com/s/files/1/0429/0953/2323/files/97779341001.pdf
    • https://cdn.shopify.com/s/files/1/0432/5802/0004/files/pathogenesis_of_essential_hypertension.pdf
    • https://cdn.shopify.com/s/files/1/0428/2767/7852/files/xupidegasaka.pdf
    • https://cdn.shopify.com/s/files/1/0438/3290/1789/files/neoclassical_economics_theory.pdf
    • https://cdn.shopify.com/s/files/1/0430/3791/7333/files/samojixorokanopu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5563/5880/files/kavizefizenasolovulos.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_off0000630a.bin
26760c37ebc62ff76f55e9d6debe3730a7faac4b09437d21f38db3fbe36b7ab8
pdf-font-stream PDF embedded font (sfnt) at offset 0x630A 5140 bytes
font_01_sfnt_off0000749e.bin
b1d03a35ebf6810de2781e711aa79d57a1f3e6045f511d97e6f70e68ff291ab9
pdf-font-stream PDF embedded font (sfnt) at offset 0x749E 12004 bytes