Malicious PDF — malware analysis report

Static analysis result for SHA-256 49a8b9ce20c9ce46…

MALICIOUS

PDF

40.8 KB Created: 2020-08-21 07:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf870a0345d46ea80f6645dcd3151de5 SHA-1: 1c99589e8bbeb9fd796d9cc70f9a724249584792 SHA-256: 49a8b9ce20c9ce46109a89bb087f6765a96e039c2ba1de89f1320d3b694a1de4
128 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains text related to 'free printable multiplication worksheets grade 2' and includes the malicious URL, attempting to disguise itself as educational content. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to Shopify, likely to obscure the malicious redirector.

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=free+printable+multiplication+worksheets+grade+2
    • http://files.nwtherapy.solutions/uploads/1/3/0/7/130740298/7895457.pdf
    • http://files.paulbergerpictures.com/uploads/1/3/0/7/130776757/3296e26149560a3.pdf
    • https://cdn.shopify.com/s/files/1/0428/5802/1027/files/20885949004.pdf
    • https://cdn.shopify.com/s/files/1/0432/5795/4467/files/california_dmv_bill_of_sale.pdf
    • https://cdn.shopify.com/s/files/1/0449/0412/0475/files/is_project_64_safe.pdf
    • https://cdn.shopify.com/s/files/1/0429/4659/2924/files/sufelorosi.pdf
    • https://cdn.shopify.com/s/files/1/0436/9488/2984/files/bhagavad_gita_in_kannada_language.pdf
    • https://cdn.shopify.com/s/files/1/0430/7664/9124/files/prius_manual_transmission.pdf
    • https://cdn.shopify.com/s/files/1/0432/8760/9497/files/capital_investment_appraisal_excel_template.pdf
    • https://cdn.shopify.com/s/files/1/0440/3403/1766/files/15627756996.pdf
    • https://cdn.shopify.com/s/files/1/0430/1537/2949/files/lupidabunuxalewof.pdf
    • https://cdn.shopify.com/s/files/1/0434/3260/7894/files/snapseed_for_windows.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_off00005b6b.bin
8e4960121bba41421f9a80fcf00d2d84ae012641432441500e738531694b86ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B6B 5872 bytes
font_01_sfnt_off00006f3d.bin
cb75ad5d02e109d0d10e79b2cf3a9db7726704e708b06276adc8f53a71077689		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F3D 11604 bytes

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