Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6e7a285b2d11bed…

MALICIOUS

PDF

38.3 KB Created: 2020-08-12 14:10:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c9b6de0907acc740683817c80fa45e2 SHA-1: e89fc963c4ea80789ed5cc1883079ee538ba3ff5 SHA-256: b6e7a285b2d11bed3c1cb8e2638e4249debe68ced1e3cc3279f984f52afbbd82
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in T1059.001 PowerShell

The PDF file contains a large number of embedded links, many pointing to Shopify-hosted PDFs, which is indicative of a link farm or SEO poisoning tactic. One of the primary links, 'https://ttraff.com/wb?keyword=maths%20symmetry%20worksheets%20year%201', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL, suggesting the intent is to redirect users to malicious content under the guise of educational worksheets.

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.com/wb?keyword=maths%20symmetry%20worksheets%20year%201
    • http://files.letrim.com/uploads/1/3/1/3/131380745/6fda5.pdf
    • http://files.kismetkidsyoga.com/uploads/1/3/1/4/131437074/4230936.pdf
    • http://dusukipo.charaguaministries.com/uploads/1/3/1/3/131380600/7ca4c.pdf
    • http://files.thehealthyessence.com/uploads/1/3/1/3/131398385/kokisimasadi.pdf
    • http://files.kimberleychiropractic.com/uploads/1/3/0/8/130874276/sitatafarixev.pdf
    • https://cdn.shopify.com/s/files/1/0436/1509/2893/files/hashimoto_thyroiditis_clinical_and_diagnostic_criteria.pdf
    • https://cdn.shopify.com/s/files/1/0438/2693/8018/files/96999515584.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pejolezogumulugadajo.pdf
    • https://cdn.shopify.com/s/files/1/0433/1434/8197/files/romoluwemibisi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bafewemuwidizisaj.pdf
    • https://cdn.shopify.com/s/files/1/0435/3972/6487/files/english_grammar_in_urdu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6406/6209/files/rorofanudofo.pdf
    • https://cdn.shopify.com/s/files/1/0433/5419/4085/files/zatupulidakedu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6808/7701/files/causas_y_consecuencias_del_acoso_escolar.pdf
    • https://cdn.shopify.com/s/files/1/0433/3587/6776/files/67303697472.pdf
    • https://cdn.shopify.com/s/files/1/0438/3614/5814/files/72606709680.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_off00005825.bin
4f88d5e1a74adefbad184175bc46ee5aa48739bdb005f6f42abac360b14356e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5825 5208 bytes
font_01_sfnt_off000069d4.bin
e910e8a1a7f866a03653528cf0962cb7ace34e835b060944fa5239b9065fd6bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69D4 10160 bytes

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