Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c633c78785b1217…

MALICIOUS

PDF

43.4 KB Created: 2020-08-30 15:24:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 112240f773721413e8aa2b85a0d01bbc SHA-1: 428a4b87693df4df5bf303d9ded05d6151a36300 SHA-256: 3c633c78785b1217afb33b88fcefd020874d7e9c860d363db489106ebf68e0a3
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to Shopify domains, which is indicative of a link farm. One of these links, 'https://ttraff.me/wix?keyword=bovespa+brasil+yahoo+grupos+chat', is identified as a malicious redirector. The document body, though heavily obfuscated, contains this malicious URL and appears to be generated by wkhtmltopdf, suggesting a programmatic approach to creating the lure. The ML classifier also strongly flagged this PDF as malicious.

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=bovespa+brasil+yahoo+grupos+chat
    • https://cdn.shopify.com/s/files/1/0435/7265/8335/files/jevuxudik.pdf
    • https://cdn.shopify.com/s/files/1/0433/5442/3464/files/48764489036.pdf
    • https://cdn.shopify.com/s/files/1/0439/8671/4782/files/innosilicon_a4_dominator.pdf
    • https://cdn.shopify.com/s/files/1/0431/8792/9252/files/8._2_angles_in_polygons_answers.pdf
    • https://cdn.shopify.com/s/files/1/0435/6666/1800/files/komurowigewigedo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4690/3701/files/larukugofuleneniwizin.pdf
    • https://cdn.shopify.com/s/files/1/0462/3764/7002/files/tagalog_tongue_twister.pdf
    • https://cdn.shopify.com/s/files/1/0434/2674/2421/files/75120694461.pdf
    • https://cdn.shopify.com/s/files/1/0430/4073/5381/files/39099052331.pdf
    • https://cdn.shopify.com/s/files/1/0436/4809/0270/files/ielts_reading_academic_2020.pdf
    • https://cdn.shopify.com/s/files/1/0457/0211/9580/files/carers_leave_application_form_ireland.pdf
    • https://cdn.shopify.com/s/files/1/0429/2929/1427/files/22069220508.pdf
    • https://cdn.shopify.com/s/files/1/0437/2771/6520/files/tikevivanefuxoziwob.pdf
    • https://cdn.shopify.com/s/files/1/0440/3894/6966/files/kifakukubidesogunaweberu.pdf
    • https://cdn.shopify.com/s/files/1/0429/0255/2742/files/aldous_huxley_island_download.pdf
    • https://static.usrfiles.com/ugd/b8c837_3c18c599f1804bd293cf5e7b71338cb3.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_e88eff06fa524d9ab6abd5fbd8d12ee7.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067cf.bin
eb4326114355bbaa1c0a0aa8e34710e6a8ab4cc7f639cd022ebe1cc04b4ef7d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67CF 5544 bytes
font_01_sfnt_off00007ab1.bin
8601e4a9e5cbee7ecf4830849ec69bf6d2d291620aacdda2b29870aa3d3989d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AB1 11124 bytes

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