Malicious PDF — malware analysis report

Static analysis result for SHA-256 69f8e6924f17a2a3…

MALICIOUS

PDF

48.4 KB Created: 2020-08-23 13:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 678be0ce6eb467e0427a407c8b967a72 SHA-1: e7521f623fcc051469d658a44b3e7cfaa9e825a0 SHA-256: 69f8e6924f17a2a3f032aa303301ba4036427f0427c2d04a362100a02c70e811
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=calibre+android+ebook', suggesting a lure to download or access content related to 'calibre android ebook'. The ML classifier also strongly indicated maliciousness.

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.ru/pify?keyword=calibre+android+ebook
    • http://zupegop.everythingalcoholink.com/uploads/1/3/1/4/131438667/gupajer.pdf
    • http://files.limitedchocolate.com/uploads/1/3/0/7/130775698/1128482.pdf
    • http://files.churchilltimberworks.com/uploads/1/3/1/4/131405977/tixibeme.pdf
    • http://files.apartmrome.com/uploads/1/3/0/8/130814874/8930754.pdf
    • http://files.cashclubco.com/uploads/1/3/1/6/131606630/bifadado.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/3033/8966/files/sph_urban_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0440/6083/6005/files/foresizidoranenegabex.pdf
    • https://cdn.shopify.com/s/files/1/0434/7016/0032/files/oss_bss_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/0595/9574/files/voriwedaj.pdf
    • https://cdn.shopify.com/s/files/1/0437/5547/1002/files/kewineguvimoxizofu.pdf
    • https://cdn.shopify.com/s/files/1/0436/0824/4381/files/2955_john_deere.pdf
    • https://cdn.shopify.com/s/files/1/0436/8079/2729/files/43209696757.pdf
    • https://cdn.shopify.com/s/files/1/0434/9660/3814/files/kafep.pdf
    • https://cdn.shopify.com/s/files/1/0428/6251/0236/files/national_treasury_risk_management_framework.pdf
    • https://cdn.shopify.com/s/files/1/0431/2760/3354/files/47950906264.pdf
    • https://cdn.shopify.com/s/files/1/0430/9945/5642/files/58783845157.pdf
    • https://cdn.shopify.com/s/files/1/0431/9769/4109/files/bhagavad_gita_telugu_meaning.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c2f.bin
79b463aeba7ea07477b7f4c79d0a81f114407fcb9833a68d5abb5ccf2dbe5904		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C2F 4748 bytes
font_01_sfnt_off00007c59.bin
1fa9bce4249404944fcc29061e1a2e4fca92fa860a97b1334b1f2fd5f5b723f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C59 10076 bytes
font_02_sfnt_off00009ef1.bin
4189bb5d82d37c3b06c761c00ca3b3c8a7a7312639514cd6a20481e76712d457		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EF1 16388 bytes

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