Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d3877704aa5eb93…

MALICIOUS

PDF

43.2 KB Created: 2020-08-15 18:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d7ede95a652e42156cef9cf728bd977 SHA-1: 939eb1638d2a184f80490a3dd3b0529a5b18661e SHA-256: 7d3877704aa5eb9356fb3b210dd126a759eb720a24026990ea7fa55837d58cf1
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, pointing to ttraff.cc, and PDF_SEO_LINK_FARM, indicating a large number of external links. The document body, though heavily obfuscated, contains the same malicious URL and several Shopify URLs, some of which are confirmed benign while others are unknown. The primary attack pattern involves redirecting users to malicious infrastructure via a link farm, likely to host further malicious content or phishing pages.

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.cc/wb?keyword=conditionals%20esl%20worksheets%20pdf
    • http://files.portlandcommunityfund.org/uploads/1/3/1/4/131411281/wobixikogimi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0537/7701/files/71250420974.pdf
    • https://cdn.shopify.com/s/files/1/0430/4191/5042/files/create_watermark_on_document.pdf
    • https://cdn.shopify.com/s/files/1/0433/4357/7246/files/antonyms_words_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0436/2531/6514/files/applied_microsoft_business_intelligence_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/4765/6343/files/53263879351.pdf
    • https://cdn.shopify.com/s/files/1/0430/7573/1616/files/zevepode.pdf
    • https://cdn.shopify.com/s/files/1/0434/7723/7917/files/65834075674.pdf
    • https://cdn.shopify.com/s/files/1/0431/9988/9569/files/botusoxerojiba.pdf
    • https://cdn.shopify.com/s/files/1/0430/6485/2634/files/kosegaw.pdf
    • https://cdn.shopify.com/s/files/1/0434/7248/6564/files/84053911605.pdf
    • https://cdn.shopify.com/s/files/1/0434/8664/2338/files/xogukudalit.pdf
    • https://cdn.shopify.com/s/files/1/0439/3808/7070/files/biometria_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0430/1560/2337/files/sijupuvezapisojolakaf.pdf
    • https://cdn.shopify.com/s/files/1/0428/6654/0711/files/52597566199.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006095.bin
acb749306db0d0e9a896d1dfc0d87fff80fe7e4a7c5e5bdb556fc566a7734ed2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6095 5188 bytes
font_01_sfnt_off00007248.bin
017f588cacd86cf56b10a00f728d65bd5f965530a1f552f82197a9ba68b9b401		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7248 14844 bytes

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