Malicious PDF — malware analysis report

Static analysis result for SHA-256 19a0cc229f66fac4…

MALICIOUS

PDF

36.7 KB Created: 2020-09-01 05:30:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9208dc528e1d7f6f69ed4c963dc287d3 SHA-1: b3076fb76474ad897979e55c0c83626f9bf6eb34 SHA-256: 19a0cc229f66fac4ff5ed90ec5845da91f46aa67341afdc8c553576a87c52a77
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'https://ttraff.me/wix?keyword=british+council+worksheets+pdf'. The document body, though heavily obfuscated, also contains this URL and numerous other links to PDF files hosted on Shopify, suggesting a link farm or SEO poisoning attempt. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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.me/wix?keyword=british+council+worksheets+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9815/2866/files/vasemidis.pdf
    • https://cdn.shopify.com/s/files/1/0435/4224/9631/files/33321536468.pdf
    • https://cdn.shopify.com/s/files/1/0430/7540/3936/files/sirupibosenofulepuk.pdf
    • https://cdn.shopify.com/s/files/1/0463/6665/4619/files/weekend_itinerary_template_word.pdf
    • https://cdn.shopify.com/s/files/1/0440/7607/3125/files/teoria_causalista_de_la_accion.pdf
    • https://static.usrfiles.com/ugd/0d2908_6c48f47c2d5e4ee38ff227310d412c9c.pdf
    • https://static.usrfiles.com/ugd/7d1dc9_d456af560e294aabb54c57869ca183f3.pdf
    • https://static.usrfiles.com/ugd/cafc24_360f7fd9c6fd475883ccf463ca57a607.pdf
    • https://static.usrfiles.com/ugd/b8c837_2221e226f0e647fa94630d322fa78eca.pdf
    • https://static.usrfiles.com/ugd/271e65_ed31574017854f5ea4c587d55e9f54c6.pdf
    • https://cdn.shopify.com/s/files/1/0455/7688/0293/files/tylenol_and_ibuprofen_dosing_chart.pdf
    • https://cdn.shopify.com/s/files/1/0432/9085/3541/files/12012882658.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/damufezeloge.pdf
    • https://cdn.shopify.com/s/files/1/0439/5089/9368/files/jaxubo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7513/2824/files/begemofanaxetebo.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_off00005377.bin
b69148f6a3e54ad937c0414946ad61d167540df8303b85bcf4ad1771ee414704		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5377 5240 bytes
font_01_sfnt_off0000655f.bin
d40710fbc4499bcdce33f29ceb415aabf78c40bb9d9c7fc5c4f0c6835dc579cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x655F 9460 bytes

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