Malicious PDF — malware analysis report

Static analysis result for SHA-256 c565878ccd358842…

MALICIOUS

PDF

62.1 KB Created: 2020-08-16 01:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3cb4923386c10904bbac1f9aee4b85c SHA-1: 83ac8f47f5a714f8e66029092f27b5dd3d5a3fac SHA-256: c565878ccd358842b6a87eb346781275df7d8105b94988870ea4cdfa7966b97a
150 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, appears to contain the same lure URL. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO manipulation tactic to disguise the malicious redirector. The ML classifier also strongly indicated maliciousness.

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.ru/wb?keyword=ielts%20writing%20task%201%20and%202%20practice%20pdf
    • http://files.michannehoctorthompson.com/uploads/1/3/0/8/130813860/bixekaxu.pdf
    • http://files.jhschoir.org/uploads/1/3/2/7/132712115/lamifazidizimojad.pdf
    • https://cdn.shopify.com/s/files/1/0437/1431/4405/files/real_mathematical_analysis_springer.pdf
    • https://cdn.shopify.com/s/files/1/0434/6681/7689/files/jafuxutimimo.pdf
    • https://cdn.shopify.com/s/files/1/0432/1142/3902/files/muzotir.pdf
    • https://cdn.shopify.com/s/files/1/0433/7539/4977/files/cinematography_glossary.pdf
    • https://cdn.shopify.com/s/files/1/0436/2053/2386/files/wegoz.pdf
    • https://cdn.shopify.com/s/files/1/0432/6660/5211/files/8396447694.pdf
    • https://cdn.shopify.com/s/files/1/0443/8438/7238/files/kotizewopawavuxefe.pdf
    • https://cdn.shopify.com/s/files/1/0431/6335/3244/files/cooling_tower_parts.pdf
    • https://cdn.shopify.com/s/files/1/0428/1643/8438/files/mettre_clavier_azerty_sur_android.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008e3d.bin
49907380c94d9e5ae150328885ab611c5a43a3f254c9901e0bf8ae093e4c8f68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E3D 5600 bytes
font_01_sfnt_off0000a171.bin
6b43de4e3644385a4c80d637968d3163ab74deb7d1ea870a49c189dd26fbd750		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA171 21912 bytes
font_02_sfnt_off0000d63c.bin
e7273338525a866f49bd556f13a0e46ce1e8513f85f175d9d987aa1f8b89adb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD63C 16068 bytes

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