Malicious PDF — malware analysis report

Static analysis result for SHA-256 41b96b1f94c7c606…

MALICIOUS

PDF

41.6 KB Created: 2020-08-25 07:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc34aba8051640b47a295384d95c7f96 SHA-1: 5c3091f56d359a08e346eb4bc9051049f8b4fbea SHA-256: 41b96b1f94c7c60667e5ac8aebb0948d720a68fccb0240e63080b8fdd673e607
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a tactic to manipulate search engine results or distribute content. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack pattern appears to be the distribution of malicious links within the document.

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=castillo+serralles+informacion
    • http://files.eddiebotha.com/uploads/1/3/1/4/131437005/b90bc7febe2eb2.pdf
    • http://xagef.epicrobotics.co.uk/uploads/1/3/2/7/132740405/joporenixekuporuriba.pdf
    • http://files.dreamingofthereds.com/uploads/1/3/1/4/131453267/lekij.pdf
    • http://fedix.onestophistoryshop.com/uploads/1/3/0/9/130969408/mudemize.pdf
    • https://cdn.shopify.com/s/files/1/0429/9954/6010/files/formal_definition_of_aurora_borealis.pdf
    • https://cdn.shopify.com/s/files/1/0429/9482/7415/files/andhra_jyothi_epaper_sunday_book.pdf
    • https://cdn.shopify.com/s/files/1/0453/3600/2715/files/wevarik.pdf
    • https://cdn.shopify.com/s/files/1/0436/2846/2240/files/5542669493.pdf
    • https://cdn.shopify.com/s/files/1/0437/1188/9573/files/data_analyst_cv_template_uk.pdf
    • https://cdn.shopify.com/s/files/1/0437/8486/3893/files/13029825892.pdf
    • https://cdn.shopify.com/s/files/1/0431/7511/6959/files/99502649726.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_off00006466.bin
58beb62c113c48006df350846e90276b0d690e4360f57dda5b6271bd2a302fc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6466 4932 bytes
font_01_sfnt_off0000750e.bin
eadccd1488921607150a6306ea889aeb9321f7b625a1e8534e683367452e9b87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x750E 11104 bytes

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