Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa9ca9bef8eaa758…

MALICIOUS

PDF

42.3 KB Created: 2020-08-15 21:36:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5cbc68b9d0035ed1d1614ced1253e349 SHA-1: 3e72193941770c2586d0c4e4fa1ef4764416e8a7 SHA-256: aa9ca9bef8eaa758db15cf2b3369b6f4a63a4ddd57a7837607b1fa355259bfd1
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many pointing to Shopify domains, which is characteristic of a link farm used to obscure malicious redirectors. The primary malicious URL identified is https://ttraff.ru/wb?keyword=italic%20calligraphy%20worksheets, which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains the text 'Italic calligraphy worksheets' and the malicious URL, suggesting a lure to disguise the malicious intent. No scripts were extracted, and the PDF structure itself is the primary vector for the attack.

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/wb?keyword=italic%20calligraphy%20worksheets
    • http://files.tutshillpreschool.org/uploads/1/3/2/7/132710797/52e80f99a6bc36.pdf
    • http://vitupiw.yorktownplumbing.com/uploads/1/3/0/9/130969754/1271433.pdf
    • http://fogivoro.listerpartyrental.com/uploads/1/3/1/6/131606523/betuwipinalefus.pdf
    • http://files.starboycreations.com/uploads/1/3/1/4/131408798/fixavawigegenom.pdf
    • http://files.sgionet.com/uploads/1/3/0/8/130874413/zujojunejiguwimurob.pdf
    • https://cdn.shopify.com/s/files/1/0434/9935/6324/files/welakorugazorejerir.pdf
    • https://cdn.shopify.com/s/files/1/0437/9371/1265/files/free_printable_cards_for_all_occasions.pdf
    • https://cdn.shopify.com/s/files/1/0432/9439/2485/files/2005_suzuki_king_quad_700.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jezimix.pdf
    • https://cdn.shopify.com/s/files/1/0433/8748/6358/files/bhagavad_gita_malayalam_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/6031/3768/files/building_design_plan_and_elevation.pdf
    • https://cdn.shopify.com/s/files/1/0431/3110/9538/files/gibowuwu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1459/4464/files/78539540386.pdf
    • https://cdn.shopify.com/s/files/1/0434/1792/7837/files/2932218516.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_off00006732.bin
e56d7aace219a948622b77671f2019850b50be08ea51891759a6a66f99671b36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6732 5388 bytes
font_01_sfnt_off0000798d.bin
44bf86210edeac38c5302ced249e15a5e6835d39f3f50be43153d811c71692a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x798D 10168 bytes

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