Malicious PDF — malware analysis report

Static analysis result for SHA-256 94247126eec458a3…

MALICIOUS

PDF

36.0 KB Created: 2020-08-18 21:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d74fa7107fff7673628abc3bb38a3f43 SHA-1: ede9dd6d268b7a94c5d653aab77cb68b7fddaab0 SHA-256: 94247126eec458a3564a339888595980c30067b954c09adc098c8c28f3cab90a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Addends

The PDF file contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves a link farm designed to redirect users to malicious infrastructure, likely for further exploitation or phishing.

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=geographic+coordinates+worksheet
    • http://files.jstello.com/uploads/1/3/2/7/132740763/musizidim.pdf
    • https://cdn.shopify.com/s/files/1/0431/2216/3876/files/77331431905.pdf
    • https://cdn.shopify.com/s/files/1/0430/3791/7335/files/86866148693.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/najitis.pdf
    • https://cdn.shopify.com/s/files/1/0435/9772/5864/files/63259910529.pdf
    • https://cdn.shopify.com/s/files/1/0431/7567/4012/files/48195121731.pdf
    • https://cdn.shopify.com/s/files/1/0434/6583/4649/files/acer_c720_chromebook.pdf
    • https://cdn.shopify.com/s/files/1/0431/3530/3831/files/14495158628.pdf
    • https://cdn.shopify.com/s/files/1/0434/0151/1077/files/80040373049.pdf
    • https://cdn.shopify.com/s/files/1/0429/6572/9429/files/can_i_really_trust_the_bible.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_off00004f29.bin
fe545c3b75d9efe1482481084eff281904556285536189705ba85d58d09bbb4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F29 5492 bytes
font_01_sfnt_off000061e2.bin
02e58c7c7bbf5fd40d0697ea771676bcc6933b76e21224a96b1a3e22639a1d36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61E2 9912 bytes

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