Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a8348e866e0281b…

MALICIOUS

PDF

44.6 KB Created: 2020-08-24 22:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4912c86de09661b7df7d9467cd733c9b SHA-1: b71f4cd60c817f1fdb2e3591940bc9475a9f88e0 SHA-256: 9a8348e866e0281ba9ba9be41b362b1509e8506aabe3c51b17e900e0269fa220
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it directs users to malicious infrastructure. The document body, though heavily obfuscated, contains text related to 'free math worksheets' and a URL that appears to be a redirector. The presence of numerous external PDF links, as flagged by PDF_SEO_LINK_FARM, suggests a link farm or SEO poisoning tactic to distribute malicious content. The primary IOC is the redirector URL, which is likely used to funnel victims to a secondary malicious site.

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/pify?keyword=free+math+worksheets+grade+7+geometry
    • http://ligiwuvez.kneadmassagetherapy.com/uploads/1/3/2/6/132682883/397176.pdf
    • http://vagurukix.cristidenney.com/uploads/1/3/1/3/131379641/gajimari_ritiraram_nawibijin.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dadimutixiwukigojubiw.pdf
    • https://cdn.shopify.com/s/files/1/0436/9560/3865/files/67876832482.pdf
    • https://cdn.shopify.com/s/files/1/0432/8970/6664/files/481809900.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/12091312038.pdf
    • https://cdn.shopify.com/s/files/1/0430/3729/4741/files/rasevajitaxeku.pdf
    • https://cdn.shopify.com/s/files/1/0433/6871/0300/files/nonawowabor.pdf
    • https://cdn.shopify.com/s/files/1/0438/4574/6838/files/63648250563.pdf
    • https://cdn.shopify.com/s/files/1/0433/3276/3801/files/74619563010.pdf
    • https://cdn.shopify.com/s/files/1/0459/9962/0263/files/aella_credit_loan_app.pdf
    • https://cdn.shopify.com/s/files/1/0430/9381/9541/files/68207731355.pdf
    • https://cdn.shopify.com/s/files/1/0429/1634/8057/files/30122708905.pdf
    • https://cdn.shopify.com/s/files/1/0431/8488/1825/files/zokaxopifekotobodanugoxef.pdf
    • https://cdn.shopify.com/s/files/1/0432/9242/6405/files/rapipipalumiwumadoj.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_off00006ef2.bin
ae53b06ef98fcd2908d1fe8e49013eba1d778e7fd4a0941563585638590c2930		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EF2 5500 bytes
font_01_sfnt_off0000819d.bin
90ad129a7b6e6871f22755ce85bf5b5bc9b4b004f612b4b51c07c2992c0dcd37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x819D 10464 bytes

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