Malicious PDF — malware analysis report

Static analysis result for SHA-256 741cc1e64cac2eea…

MALICIOUS

PDF

41.0 KB Created: 2020-08-28 15:57:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5bf2f6d689fb18efbb9e33943432e66c SHA-1: 6b4f1669a2cc49244e061cd70f819bbb80ea90c3 SHA-256: 741cc1e64cac2eea5bbf88184c48158bf4988acbca488fe14d2afe4e91342b47
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with at least one pointing to a known malicious redirector. The document body, though obfuscated, appears to contain text related to 'the lottery short story pdf' and references the wkhtmltopdf tool, suggesting a lure to download or view content. 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.cc/pify?keyword=the+lottery+short+story+pdf
    • http://files.search.canustrealtyinc.com/uploads/1/3/1/3/131379844/8707806.pdf
    • http://fupigod.dublinsolicitorscpd.com/uploads/1/3/1/4/131407164/b26f3ac846d43e2.pdf
    • http://tozoxuj.englishinisrael.com/uploads/1/3/0/7/130739344/0e4c67.pdf
    • http://suled.proofreading-course.com/uploads/1/3/0/7/130738731/6739610.pdf
    • http://files.chriskernutt.com/uploads/1/3/1/4/131407918/fopekotobexezexum.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0447/6397/1733/files/clerk_of_works_weekly_report_sample.pdf
    • https://cdn.shopify.com/s/files/1/0430/5109/0077/files/90087812874.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/32296476761.pdf
    • https://cdn.shopify.com/s/files/1/0437/6975/7850/files/mad_libs_worksheets_for_adults.pdf
    • https://cdn.shopify.com/s/files/1/0433/2729/1547/files/file_tidak_bisa_dibuka_di_outlook.pdf
    • https://cdn.shopify.com/s/files/1/0437/6051/7274/files/19502150091.pdf
    • https://cdn.shopify.com/s/files/1/0432/0418/2173/files/zupawudekexetupefus.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_off00006351.bin
d7e176c8746455813706178cf3fb3d3c0f40a6ac39093bb37985e83cf84030cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x6351 4972 bytes
font_01_sfnt_off00007441.bin
ab899d2f74c7b1236d28f835a060ccc7e5cfc79b909246dcc8ca65e293bc4c5e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7441 10300 bytes