Malicious PDF — malware analysis report

Static analysis result for SHA-256 23b0b8f8d4020cf5…

MALICIOUS

PDF

40.2 KB Created: 2020-08-14 05:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f89c3c20c1de3695bfff28d3b8f1e1e SHA-1: 20df4fc67ccef99946532a1b3dc4045f3dd49af9 SHA-256: 23b0b8f8d4020cf54d0512b95698292035bb642ffc6ef54c9025997e2b462a8e
128 Risk Score

Malware Insights

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

The PDF contains a link disguised as a download for sound effects, which redirects to a known malicious URL. It also functions as a link farm, with numerous embedded links pointing to external PDFs, likely for SEO manipulation or to host further malicious content. The presence of a visual download button heuristic further supports the lure-based attack pattern.

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.ru/pify?keyword=airplane+take+off+sound+effects+free
    • http://files.shopwicksnbits.com.au/uploads/1/3/1/3/131379792/7568800.pdf
    • http://files.hracademia.org/uploads/1/3/0/9/130969992/tarubajiredixison.pdf
    • http://files.hotgandts.com/uploads/1/3/0/8/130813413/zavedevobufutopuso.pdf
    • https://cdn.shopify.com/s/files/1/0436/9534/1723/files/witewopat.pdf
    • https://cdn.shopify.com/s/files/1/0438/4607/4525/files/analise_sinttica_e_morfologica.pdf
    • https://cdn.shopify.com/s/files/1/0432/6732/6110/files/vizuzajisejukuv.pdf
    • https://cdn.shopify.com/s/files/1/0431/6102/6719/files/19549849167.pdf
    • https://cdn.shopify.com/s/files/1/0436/8377/4614/files/sample_essay_for_ielts_writing_task_2.pdf
    • https://cdn.shopify.com/s/files/1/0427/9150/1990/files/71012289626.pdf
    • https://cdn.shopify.com/s/files/1/0438/4748/3552/files/bodetiwegitapivado.pdf
    • https://cdn.shopify.com/s/files/1/0431/7036/5589/files/exercice_appareillage_electrique.pdf
    • https://cdn.shopify.com/s/files/1/0428/2122/2567/files/bracing_in_construction.pdf
    • https://cdn.shopify.com/s/files/1/0429/1782/2620/files/sovowinubujiwimojekofo.pdf
    • https://cdn.shopify.com/s/files/1/0433/4456/0281/files/lamumajujolazaxalugewe.pdf
    • https://cdn.shopify.com/s/files/1/0432/8144/9124/files/algebraic_expressions_test.pdf
    • https://cdn.shopify.com/s/files/1/0432/7122/5502/files/dekifosib.pdf
    • https://cdn.shopify.com/s/files/1/0438/6747/2037/files/bankers_adda_current_affairs_one_liner.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_off000053f7.bin
628c814a210521130bf49b8026ba712cb237caa295c9f0c1fa549bcb48912f3d
pdf-font-stream PDF embedded font (sfnt) at offset 0x53F7 5200 bytes
font_01_sfnt_off000065ad.bin
f792d2c0944d798f7706e296ff04c60008ab872ca1d14055a1c2bac676199d5c
pdf-font-stream PDF embedded font (sfnt) at offset 0x65AD 14924 bytes