Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8dfb317f0b95db6…

MALICIOUS

PDF

44.0 KB Created: 2020-08-05 16:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a797edaee050815cc772e174e0c44d1 SHA-1: 960151eaf17fbf1eeb14af63e89c63c646f788ca SHA-256: f8dfb317f0b95db6b20fbd3e26dff64565535350adcc3926583029bcc62ca7ce
120 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body text, though partially corrupted, suggests a lure related to 'Classroom language english pdf'. The PDF_SEO_LINK_FARM heuristic indicates the presence of numerous external links, likely for SEO manipulation or to distribute further malicious content. The primary malicious IOC is the redirector URL.

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/pify?keyword=classroom+language+english+pdf
    • http://putarub.veronicaholisticteacher.com/uploads/1/3/1/4/131438142/bogubovipapi_vikukijiso_molazaxi.pdf
    • http://files.shelter2home.com/uploads/1/3/1/8/131856492/1890141.pdf
    • http://wujekul.nideyphotography.com/uploads/1/3/2/6/132683328/56c091daf4b.pdf
    • http://wujekul.nideyphotograp
    • https://cdn.shopify.com/s/files/1/0432/6886/6208/files/93090826764.pdf
    • https://cdn.shopify.com/s/files/1/0430/1763/3949/files/jikeruwux.pdf
    • https://cdn.shopify.com/s/files/1/0428/9154/2681/files/jofawolewizom.pdf
    • https://cdn.shopify.com/s/files/1/0434/5279/2982/files/14282660252.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sujaxitedidubabupopivup.pdf
    • https://cdn.shopify.com/s/files/1/0427/9864/5404/files/95563068322.pdf
    • https://cdn.shopify.com/s/files/1/0433/1575/7214/files/54625412954.pdf
    • https://cdn.shopify.com/s/files/1/0430/4922/2298/files/dokofov.pdf
    • https://cdn.shopify.com/s/files/1/0436/9183/5545/files/zovokovijijogozu.pdf
    • https://cdn.shopify.com/s/files/1/0440/2230/0822/files/michigan_commercial_drivers_license_practice_test.pdf
    • https://cdn.shopify.com/s/files/1/0437/6638/2746/files/66007891379.pdf
    • https://cdn.shopify.com/s/files/1/0429/6074/8695/files/77376100303.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_off00006e07.bin
24097521457cce0b1b2111d355f39a6b9c3de711864ccde0b31ec79113e6f587		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E07 5360 bytes
font_01_sfnt_off00008011.bin
be39d05b61803384daacb0af1aced3b6d98ea04133bce3e5d8d69c20bd5af788		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8011 10176 bytes

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