Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c0a877e21416aac…

MALICIOUS

PDF

42.9 KB Created: 2020-08-18 20:38:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 004adea25e0c8433618b8a7ce0ad3cb6 SHA-1: f22d0a77989ce701ddc6217659b273f081eb2109 SHA-256: 8c0a877e21416aac094440b70a21312f68493c4c3b7c5a2053b36f173e2f2aac
150 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, with a critical heuristic firing for a malicious redirector. The document body, though partially corrupted, contains text related to 'candlestick chart pattern' and a URL that matches the redirector. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves redirecting users to malicious infrastructure via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=pdf+of+candlestick+chart+pattern
    • http://files.globalafricadiaspora.org/uploads/1/3/1/4/131454219/3710953.pdf
    • http://movemuxek.khalsaacupuncture.com/uploads/1/3/1/3/131384635/bukokap_fered.pdf
    • https://cdn.shopify.com/s/files/1/0431/5650/4744/files/torowowuxeveb.pdf
    • https://cdn.shopify.com/s/files/1/0432/0513/2445/files/63229841763.pdf
    • https://cdn.shopify.com/s/files/1/0433/6130/4728/files/cellules_souches_msenchymateuse.pdf
    • https://cdn.shopify.com/s/files/1/0427/7652/7014/files/62354160522.pdf
    • https://cdn.shopify.com/s/files/1/0431/6381/2004/files/bookshop_automation_system.pdf
    • https://cdn.shopify.com/s/files/1/0435/8206/2753/files/3d_exporter_for_autodesk_inventor.pdf
    • https://cdn.shopify.com/s/files/1/0433/3695/8106/files/acta_constitutiva_de_una_sociedad_civil_formato_en_blanco.pdf
    • https://cdn.shopify.com/s/files/1/0430/6819/4978/files/fizij.pdf
    • https://cdn.shopify.com/s/files/1/0436/3816/1561/files/panchatantra_stories_marathi.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_off0000684e.bin
126013a8bdab978581ebbe850ad4e636a10e748832f43f3ea4622327e7f302bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x684E 5308 bytes
font_01_sfnt_off00007a54.bin
642c28d1c7f3c8dd258745d337dfaf202c3354a4110c5bfcd459cdc466a46b71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A54 10860 bytes

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