Malicious PDF — malware analysis report

Static analysis result for SHA-256 164a24716b1d3dc3…

MALICIOUS

PDF

46.0 KB Created: 2020-08-07 07:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 73d324dc6b77fd5d6e6aad7316211f27 SHA-1: 36666f3892ba2393ce2edc5e91c57fc29866f23b SHA-256: 164a24716b1d3dc3f5c3663a0b1a2ae4dd77621820212ea62cd8d029d9649e51
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 external PDF files hosted on various domains, suggesting a link farm or SEO poisoning tactic. One prominent URL, 'https://ttraff.cc/pify?keyword=mah+mba+cet+2020+syllabus+pdf', is flagged as a malicious redirector, indicating an attempt to lead users to harmful content. The document body, though heavily obfuscated, contains references to the syllabus and the malicious URL, reinforcing the lure.

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=mah+mba+cet+2020+syllabus+pdf
    • http://files.juneauflukes.org/uploads/1/3/1/4/131483361/5782277.pdf
    • http://marugaxo.ucinvestingforum.com/uploads/1/3/1/0/131070331/pepudireg-vuzesadusok-darurig.pdf
    • http://files.brandynoir.com/uploads/1/3/2/6/132695663/wesasisuvume.pdf
    • http://files.powersbaptistchurch.org/uploads/1/3/1/4/131438111/maponusurisadoxa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7399/4905/files/93365116341.pdf
    • https://cdn.shopify.com/s/files/1/0435/2806/1087/files/59191035979.pdf
    • https://cdn.shopify.com/s/files/1/0437/9181/0717/files/19760351531.pdf
    • https://cdn.shopify.com/s/files/1/0430/6396/7906/files/47188844313.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/larefojese.pdf
    • https://cdn.shopify.com/s/files/1/0430/5325/2757/files/rikeguwebufezutudavakofuj.pdf
    • https://cdn.shopify.com/s/files/1/0429/7854/1722/files/32719386353.pdf
    • https://cdn.shopify.com/s/files/1/0448/0276/9053/files/world_s_end_kenshi.pdf
    • https://cdn.shopify.com/s/files/1/0429/1641/3607/files/xolojafenigasoserer.pdf
    • https://cdn.shopify.com/s/files/1/0432/5031/9517/files/14686468637.pdf
    • https://cdn.shopify.com/s/files/1/0431/3926/8774/files/article_about_environment.pdf
    • https://cdn.shopify.com/s/files/1/0435/1950/8634/files/22914502740.pdf
    • https://cdn.shopify.com/s/files/1/0429/7077/5706/files/90543481214.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_off00007459.bin
4c36e8d3ace2efc33818e8fd67da164784ebc325302895be45170f81230a8f6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7459 5820 bytes
font_01_sfnt_off0000881c.bin
98e6f959e3fda83812c21563390a05b5bb2a3dce8da7625ea7b4238fe7db8e46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x881C 10312 bytes

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