Malicious PDF — malware analysis report

Static analysis result for SHA-256 be7e38628db58b5c…

MALICIOUS

PDF

38.2 KB Created: 2020-08-18 14:14:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e20944b381732409ae453a566506a61 SHA-1: cbf396de5c00da83bcad698cdbbafe614c81783d SHA-256: be7e38628db58b5c64d6a1b1a04d8e4f5963c5dd1f295ec9d7547c28eae61343
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to Shopify domains, but one critical link redirects to a known malicious domain (ttraff.ru). This indicates a link farm or redirector strategy designed to lead users to malicious content. The document body, though partially corrupted, suggests a lure related to 'Cinderella man question sheet answers'. No scripts were extracted, but the heuristic firings strongly suggest a malicious redirection attempt.

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=cinderella+man+question+sheet+answers
    • http://files.thecleanthumb.com/uploads/1/3/1/0/131071249/47472.pdf
    • https://cdn.shopify.com/s/files/1/0435/6987/3054/files/subenapowudovaturexoxev.pdf
    • https://cdn.shopify.com/s/files/1/0435/8311/1323/files/71854625098.pdf
    • https://cdn.shopify.com/s/files/1/0430/5158/1591/files/65828319187.pdf
    • https://cdn.shopify.com/s/files/1/0429/9191/1066/files/your_grace_still_amazes_me_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0434/8782/1984/files/ronivepege.pdf
    • https://cdn.shopify.com/s/files/1/0433/3774/4552/files/68578918524.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tugerivedisabuv.pdf
    • https://cdn.shopify.com/s/files/1/0433/1261/1481/files/epidemiology_of_acne_vulgaris.pdf
    • https://cdn.shopify.com/s/files/1/0430/2995/4721/files/viribod.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_off000057f9.bin
fd12590fe4a32d6b156693124d683fe15b28aaa79c7abde6027b0c0ac217e7a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57F9 5188 bytes
font_01_sfnt_off00006977.bin
28a54887c77a2bca2cd9adb1a2aee32ea35ae6879d006d4c54de28e5bdfee3c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6977 10196 bytes

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