Malicious PDF — malware analysis report

Static analysis result for SHA-256 224d2e8580e66b9c…

MALICIOUS

PDF

33.6 KB Created: 2020-09-08 17:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02d27030c92db704cdf4866d57dca415 SHA-1: b81c228010c47a60aa67d1a20aca3e11c7a53c7a SHA-256: 224d2e8580e66b9cc1909ce77f6b76b43956a9fd5bbc455c814deecfc3beef32
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the text 'Fractions of amounts ks1 worksheet' and the malicious URL, suggesting a lure to disguise malicious activity. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.club/wix?keyword=fractions+of+amounts+ks1+worksheet
    • https://cdn.shopify.com/s/files/1/0431/3242/0250/files/mexavamome.pdf
    • https://cdn.shopify.com/s/files/1/0430/9309/8660/files/vuduposodadipe.pdf
    • https://cdn.shopify.com/s/files/1/0463/3637/6993/files/temuvefalusewazu.pdf
    • https://cdn.shopify.com/s/files/1/0448/4697/3088/files/reasoning_ability_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0431/0210/9856/files/99260922154.pdf
    • https://cdn.shopify.com/s/files/1/0430/3945/7429/files/postgres_list_databases.pdf
    • https://cdn.shopify.com/s/files/1/0435/6780/8667/files/wurolorozixun.pdf
    • https://static.usrfiles.com/ugd/b4f0c6_5341025b886e4afd99e110c6be3c4b18.pdf
    • https://static.usrfiles.com/ugd/c33f71_ddcc8b52b4ec4746bb9794a918bd663b.pdf
    • https://static.usrfiles.com/ugd/6908d7_d3b9f2c5095f48b98fd15c8e751bc00a.pdf
    • https://cdn.shopify.com/s/files/1/0433/8050/6791/files/govovod.pdf
    • https://cdn.shopify.com/s/files/1/0433/2165/5464/files/surah_al_kahf_full_download.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_off0000471e.bin
a4d40c07dacdb3914885ac92706f052e6ba9bc424375b281db89c7f884c6d5af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x471E 5252 bytes
font_01_sfnt_off000058e3.bin
3f6fe5a70da8abbdec6e0935075c607a0513b0513e140f275570ccf4a3f3d375		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58E3 9636 bytes

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