Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef9f546f4d7414b…

MALICIOUS

PDF

37.6 KB Created: 2020-08-22 13:14:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f977274b494dff0f7151fa3d0d9bcee2 SHA-1: 602b87baffa72de63a5f72ad3d859787d1a37650 SHA-256: 8ef9f546f4d7414b1e1d61937f1dc00644777261e719b049aeb17bfb4a6229f6
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains text related to an 'Allstate annuity income options election form', suggesting a phishing or scam lure. The presence of a link farm and a critical heuristic firing for a malicious redirector indicates a high likelihood of malicious intent, likely to redirect users to a malicious site or download further payloads.

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=allstate+annuity+income+options+election+form
    • http://majot.cordovabayyoga.com/uploads/1/3/2/6/132695325/28dcacfbf.pdf
    • http://gumer.hawkmgmt.com/uploads/1/3/0/9/130969140/jobekagajozew.pdf
    • https://cdn.shopify.com/s/files/1/0443/9290/6918/files/azure_functions_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0434/5289/1298/files/23982529559.pdf
    • https://cdn.shopify.com/s/files/1/0438/4597/6221/files/kabatodemexudajaxofa.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/13649686198.pdf
    • https://cdn.shopify.com/s/files/1/0436/8993/5002/files/zalit.pdf
    • https://cdn.shopify.com/s/files/1/0434/5180/9942/files/josomuzipoduk.pdf
    • https://cdn.shopify.com/s/files/1/0430/9227/9445/files/evans_aldol_reaction.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_off0000558e.bin
812c7ed3d167efcb63dc5ad6f04318370e6d9d04e9b3d69ca46111addfd7e8b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x558E 5252 bytes
font_01_sfnt_off00006751.bin
7d1d9c11fc1e75ef080d05f75cb01df1c28f2dc1eb08f06c3d63af29908625f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6751 10108 bytes

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