Malicious PDF — malware analysis report

Static analysis result for SHA-256 427814f8c01ca592…

MALICIOUS

PDF

46.9 KB Created: 2020-08-28 13:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24f9f00867aa6cd2a330e55b7db598af SHA-1: 8a64bd57ba5ed3b236e5509cd38a17241e660e16 SHA-256: 427814f8c01ca59207765397525dba0cb55c59a88fbaf78893a2f5f91846056e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits a PDF link farm pattern, with numerous links hosted on 'cdn.shopify.com', suggesting an attempt to generate traffic or distribute content. The ML classifier strongly flagged this PDF as malicious. The document body contains text related to 'radial nerve entrapment' and a URL that appears to be the same as the redirector.

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=exercises+for+radial+nerve+entrapmen
    • http://files.theeimersfoundation.com/uploads/1/3/0/9/130969472/7701445.pdf
    • http://files.thenaturalgrind.com/uploads/1/3/0/7/130776327/tafude_nowumopev_dunaxavi.pdf
    • http://sefakowu.frciola.com/uploads/1/3/0/7/130740074/limajifubix.pdf
    • http://votivu.australian-spirit.com/uploads/1/3/2/6/132680835/2dfadd8dfe30.pdf
    • http://files.ovhealthcenter.org/uploads/1/3/1/0/131069934/wudujo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5453/8656/files/shakespeare_the_sonnets.pdf
    • https://cdn.shopify.com/s/files/1/0430/8838/0058/files/kisuxilu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5777/3725/files/kufaxudomazodokevimu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1817/4107/files/pajevimumetusawudoputewul.pdf
    • https://cdn.shopify.com/s/files/1/0436/2852/7776/files/kezumituburaruje.pdf
    • https://cdn.shopify.com/s/files/1/0435/2717/6343/files/hydrant_flow_test_report.pdf
    • https://cdn.shopify.com/s/files/1/0437/3735/0309/files/78491908366.pdf
    • https://cdn.shopify.com/s/files/1/0460/9182/9412/files/76191681507.pdf
    • https://cdn.shopify.com/s/files/1/0448/1817/0018/files/13837856395.pdf
    • https://cdn.shopify.com/s/files/1/0447/9034/9975/files/60509253128.pdf
    • https://cdn.shopify.com/s/files/1/0431/0974/4789/files/40810750538.pdf
    • https://cdn.shopify.com/s/files/1/0434/4017/7314/files/21321461720.pdf
    • https://cdn.shopify.com/s/files/1/0435/3412/3160/files/secret_path_shawl.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_off00007917.bin
fcf929590aeeee9d33e6cf743bd4770bb0622c7e1bc788b1d62f5f3fb98fa9ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7917 5384 bytes
font_01_sfnt_off00008b58.bin
2a87ee7c2774e6a85234a9ab1676bc1f839e7459c455caabfe13c8423ded68e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B58 10192 bytes

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