Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b81a089ee936420…

MALICIOUS

PDF

39.9 KB Created: 2020-08-19 15:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 035d97c999c95ebb7fd2e2ceca0444ee SHA-1: 6b06145f089e40971baa8b2fd995c612e0f79fb6 SHA-256: 8b81a089ee936420fc42a8f36687ad080f002cb4ffa7f598cc2bc8fda1379c78
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'geometry polygons worksheet grade 4' and includes the malicious URL, suggesting a lure to a malicious site. The presence of numerous shopify.com links, some of which are benign, likely serves to mask the malicious redirector. No scripts were extracted, and the PDF structure itself does not indicate specific exploit techniques beyond redirection.

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.cc/pify?keyword=geometry+polygons+worksheet+grade+4
    • http://matudibup.ldmsmedia.com/uploads/1/3/1/4/131438500/a2ef282c70ab3c5.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/72211459569.pdf
    • https://cdn.shopify.com/s/files/1/0429/3161/7945/files/19779414041.pdf
    • https://cdn.shopify.com/s/files/1/0430/4509/3533/files/numesazuwax.pdf
    • https://cdn.shopify.com/s/files/1/0431/5955/2155/files/how_to_write_progress_report_example.pdf
    • https://cdn.shopify.com/s/files/1/0432/6624/4766/files/medical_terminology_for_health_professions_7th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0438/2579/1138/files/84911507419.pdf
    • https://cdn.shopify.com/s/files/1/0431/0073/3596/files/zevuwisobowuledo.pdf
    • https://cdn.shopify.com/s/files/1/0428/2259/8823/files/35526751756.pdf
    • https://cdn.shopify.com/s/files/1/0433/2368/7067/files/gejimagaduwoba.pdf
    • https://cdn.shopify.com/s/files/1/0429/1425/0905/files/73982762299.pdf
    • https://cdn.shopify.com/s/files/1/0441/0654/7352/files/wowaxosopeli.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_off000052ec.bin
a03dfd1df4234a5c02e970de3441bf6bce7be0ca911ea9fe43a7bd66adbe09a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52EC 5748 bytes
font_01_sfnt_off0000667b.bin
7f766fa3d6b22e45b8d4a62cba164301167bbb2490f4a2bf4f2dbdfec0d30de1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x667B 13416 bytes

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