Malicious PDF — malware analysis report

Static analysis result for SHA-256 17580ec9511cd0da…

MALICIOUS

PDF

33.8 KB Created: 2020-09-01 04:57:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fdbb1c49e248c304fb56d26c3eb7c0cf SHA-1: 22671f44dee69bc5a577e6018801522558335b05 SHA-256: 17580ec9511cd0dad2e1e436ed073ef6b9cb8e49832bb66a1c9de3e684f3a644
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded links, one of which points to a known malicious redirector infrastructure. The file also exhibits characteristics of a link farm, with numerous links to PDFs hosted on Shopify. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent, likely to redirect users to a harmful site.

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.cc/wix?keyword=un+dis+prefix+worksheet
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7537/1159/files/69441787121.pdf
    • https://cdn.shopify.com/s/files/1/0434/6209/9097/files/factorial_program_in_java.pdf
    • https://cdn.shopify.com/s/files/1/0435/3903/8360/files/88226554476.pdf
    • https://static.usrfiles.com/ugd/b8c837_d81b9089030945d886ddd7c35c0b34d2.pdf
    • https://cdn.shopify.com/s/files/1/0434/6108/3301/files/vedolorepuxazuxezajadiz.pdf
    • https://cdn.shopify.com/s/files/1/0437/3318/8762/files/cultivo_de_lombriz_roja_californiana.pdf
    • https://cdn.shopify.com/s/files/1/0429/9699/0105/files/zogizadivowoxofufanez.pdf
    • https://cdn.shopify.com/s/files/1/0429/3640/2079/files/add_alias_gmail_android.pdf
    • https://cdn.shopify.com/s/files/1/0433/0084/7781/files/52664957592.pdf
    • https://cdn.shopify.com/s/files/1/0429/2893/0979/files/58578726815.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000047f6.bin
23931bc3f7aee1bbbfb9ae71c879dcd94fb7e9d49946c0e070364a516f9845b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x47F6 5100 bytes
font_01_sfnt_off0000596b.bin
706584fc0a98fdf76b73d7a73c00b1b1efc01443378d85fd0acdd82f9ef2b97a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x596B 9924 bytes

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