Malicious PDF — malware analysis report

Static analysis result for SHA-256 5db438984fb16843…

MALICIOUS

PDF

44.3 KB Created: 2020-08-12 10:20:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3e6e3fb033bae8a21dcfe19999b9888 SHA-1: 09843cfc9d19e10ff808139b4c5ce2ff5fc88a1a SHA-256: 5db438984fb1684302f4deae05c7713713a8ab57ba1335ad25e4f8d9cfe67587
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to `https://ttraff.com/wb?keyword=worksheets%20for%2010th%20grade%20biology`, which is flagged as a malicious redirector. Additionally, the document exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF files, many of which are hosted on Shopify. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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/wb?keyword=worksheets%20for%2010th%20grade%20biology
    • http://files.simplicityaccountingllc.com/uploads/1/3/1/3/131381237/jinirorowizoredubo.pdf
    • http://files.parsonsperiodpresentations.com/uploads/1/3/1/4/131437308/jenug.pdf
    • http://files.builtforlearning.com/uploads/1/3/0/8/130814402/jixonorunexani.pdf
    • http://files.gracebiblefellowship.org/uploads/1/3/1/3/131379117/gunedujitewu_gonegapodona_ratajagediver_kinogedejag.pdf
    • http://files.aramgershuni.com/uploads/1/3/1/0/131071289/8864926.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/2611/9831/files/13811822611.pdf
    • https://cdn.shopify.com/s/files/1/0454/4584/1046/files/fexovowinefesatonufiw.pdf
    • https://cdn.shopify.com/s/files/1/0440/9619/2664/files/anger_management_curriculum.pdf
    • https://cdn.shopify.com/s/files/1/0429/7208/6423/files/3511003792.pdf
    • https://cdn.shopify.com/s/files/1/0430/9850/5369/files/durevaxizadowatuviguraj.pdf
    • https://cdn.shopify.com/s/files/1/0431/1682/2679/files/17613224509.pdf
    • https://cdn.shopify.com/s/files/1/0428/3482/1287/files/32010454583.pdf
    • https://cdn.shopify.com/s/files/1/0431/5283/4711/files/negative_questions_grammar_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0437/7369/0017/files/81925683254.pdf
    • https://cdn.shopify.com/s/files/1/0434/6665/3858/files/zybes_price_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/2031/9893/files/nuweg.pdf
    • https://cdn.shopify.com/s/files/1/0431/1810/0637/files/80495934317.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006222.bin
7ed2eb3634b03940c314a4f8d68676461d12778bba981b680950dc4d4116fe4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6222 5680 bytes
font_01_sfnt_off00007591.bin
7a1296bf1b5c0c251319c28a5b5f8740fd50036ae9d78573f598699f97e0a7fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7591 2536 bytes
font_02_sfnt_off00008072.bin
748b78bb1ab7ab3f957e54a18783971c9fd2d3a86643b03157e842b7a5d3bb4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8072 10308 bytes

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