Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7df98c32eeb8a65…

MALICIOUS

PDF

46.2 KB Created: 2020-08-04 09:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0fa1ae3be6ea169d78f083c1de65a76 SHA-1: cfa821ba7ab393cf6191c8dd9649aaece00aefa4 SHA-256: a7df98c32eeb8a65f82a4e26fbf7dcd9c0d682ec519c345d43251429217116da
128 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link that redirects to a known malicious domain, disguised as IELTS academic reading practice materials. The PDF also contains a mass of external links, many hosted on Shopify, suggesting a link farm for SEO poisoning or traffic redirection. The presence of a visual download button further supports the lure.

Heuristics 4

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=ielts+academic+reading+practice+pdf
    • http://files.humanityreboxed.com/uploads/1/3/0/9/130969592/70efc217.pdf
    • http://files.sjacksongms.org/uploads/1/3/1/8/131856433/ac55c623127.pdf
    • http://files.pickypencil.com/uploads/1/3/1/0/131071063/guzoxuzadifovodati.pdf
    • https://cdn.shopify.com/s/files/1/0439/0577/7832/files/48009630555.pdf
    • https://cdn.shopify.com/s/files/1/0429/8348/9690/files/beremosulomisadujivuji.pdf
    • https://cdn.shopify.com/s/files/1/0435/9464/5672/files/aswath_damodaran_books_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/1384/0793/files/28926707123.pdf
    • https://cdn.shopify.com/s/files/1/0429/7628/0729/files/65327090160.pdf
    • https://cdn.shopify.com/s/files/1/0430/5358/0439/files/student_attendance_system_by_barcode_scan.pdf
    • https://cdn.shopify.com/s/files/1/0437/9734/8514/files/ccpa_california.pdf
    • https://cdn.shopify.com/s/files/1/0427/6443/5612/files/4687197108.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xigazisamakolomomabixefox.pdf
    • https://cdn.shopify.com/s/files/1/0428/9999/6839/files/wiboferidazexotuva.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vukabisozudetilo.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_off00007193.bin
50f0e0633e5b869c80f31e83e7e007f4550d2c348041fc50110179061ddf2bb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7193 5412 bytes
font_01_sfnt_off000083e5.bin
775bfc943aa1957776bb59bd6e0e7d540cc6164edf85e524d374f53843a51fca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83E5 14888 bytes

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