Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c5f85e5ad817524…

MALICIOUS

PDF

44.1 KB Created: 2020-08-03 05:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b565a4c7d76f7fac0550f1d8a4c5e716 SHA-1: d6ce33b5fca644d7d377f2431350158dbb71393e SHA-256: 0c5f85e5ad817524a1c5dff09b484bf2004e0b10d111d888b5ca2e4d549e90e9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text that appears to be a lure for 'ccna data center pdf' and includes the malicious URL. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

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=ccna+data+center+pdf
    • http://titide.dsdominion.org/uploads/1/3/1/8/131857419/ccab5e2959794.pdf
    • http://files.beclewisfiction.com/uploads/1/3/1/4/131437702/bekigedobezomij.pdf
    • http://files.streamteamsunited.org/uploads/1/3/0/8/130874526/09ebabe00fee9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/5274/5375/files/banozi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0927/7095/files/29155249720.pdf
    • https://cdn.shopify.com/s/files/1/0432/7315/8806/files/12752964119.pdf
    • https://cdn.shopify.com/s/files/1/0431/1095/7210/files/65778424984.pdf
    • https://cdn.shopify.com/s/files/1/0435/3903/8359/files/7656007763.pdf
    • https://cdn.shopify.com/s/files/1/0431/2619/4336/files/27127929808.pdf
    • https://cdn.shopify.com/s/files/1/0429/5429/3402/files/juvutubaminuxezunix.pdf
    • https://cdn.shopify.com/s/files/1/0432/6604/8164/files/bugaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/1407/9143/files/tuwomoz.pdf
    • https://cdn.shopify.com/s/files/1/0431/0731/9974/files/xirukavofakisupeluluz.pdf
    • https://cdn.shopify.com/s/files/1/0432/2312/2084/files/vosuxe.pdf
    • https://cdn.shopify.com/s/files/1/0434/8493/8390/files/20078724190.pdf
    • https://cdn.shopify.com/s/files/1/0430/4499/5221/files/dexaxikatawujisotizasexu.pdf
    • https://cdn.shopify.com/s/files/1/0429/2424/5155/files/jupizejor.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006216.bin
2e28cfdd6a7f2ffc4c39b92f79eeba55e5db1b40fbfa328535a6bf97b527b39e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6216 4592 bytes
font_01_sfnt_off000071af.bin
c18dda9829c8e883e0dbbb0d57657102ec1c16a09741ff6630486a7f4881ec73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71AF 10468 bytes
font_02_sfnt_off00009567.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9567 4324 bytes

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