Malicious PDF — malware analysis report

Static analysis result for SHA-256 756664e11c45676a…

MALICIOUS

PDF

46.2 KB Created: 2020-08-23 21:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8ef2ff373b892a6776c618ce5d11d6a SHA-1: 0ea00d170b80292bae2742375add52539c9c8679 SHA-256: 756664e11c45676aa3cebbf36f887f051e2d6ce08f062e82e9a8882b61085d5d
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, https://ttraff.cc/pify?keyword=all+star+driver+education+book+answers, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary purpose is to redirect users to malicious infrastructure, likely for further exploitation or phishing.

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/pify?keyword=all+star+driver+education+book+answers
    • http://files.oakmesapta.com/uploads/1/3/0/8/130813906/285d4b.pdf
    • http://files.bigbrowndogflorals.com/uploads/1/3/2/6/132695387/jesegoxugavudunab.pdf
    • http://files.jiigulets.com/uploads/1/3/1/4/131454065/miboxorasevif_temubesubokojop_mugov.pdf
    • http://files.freshsenses.ca/uploads/1/3/1/4/131438055/4188298.pdf
    • http://files.plants-paintings.studio/uploads/1/3/2/6/132682868/tatomamenolokox_wobumubo_wujawexagu_miruwiri.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/9472/8103/files/68909076142.pdf
    • https://cdn.shopify.com/s/files/1/0432/6290/2438/files/13852733999.pdf
    • https://cdn.shopify.com/s/files/1/0431/5286/7494/files/petopika.pdf
    • https://cdn.shopify.com/s/files/1/0432/5949/4560/files/36703153964.pdf
    • https://cdn.shopify.com/s/files/1/0434/2729/9478/files/interview_questions_on_c_c_and_java_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0429/2401/5783/files/wakesitobizawajowuxofa.pdf
    • https://cdn.shopify.com/s/files/1/0428/4828/8935/files/praxis_ii_math_5161_practice_test.pdf
    • https://cdn.shopify.com/s/files/1/0429/6785/9359/files/nodat.pdf
    • https://cdn.shopify.com/s/files/1/0445/7358/9663/files/bhakta_kannappa_movie_naa_songs.pdf
    • https://cdn.shopify.com/s/files/1/0435/4700/0983/files/1453419347.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_off00007631.bin
5d57754e8b15cf1db04ee6aa7e8efec2907547131859dd3b14cbacc1f53c3180		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7631 5280 bytes
font_01_sfnt_off0000883a.bin
3e1d4f0e43c8882319d80b1e2d2ce81577e4d0c36c3cba5690d5e91f64f4be45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x883A 10316 bytes

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