Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f7140cc435fb6db…

MALICIOUS

PDF

41.9 KB Created: 2020-08-14 05:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 91481db6633941fff4018025a506cacb SHA-1: ec21fb51092ef91afac0ab1d09202fa35da4603f SHA-256: 6f7140cc435fb6dbfebf0c0f90a728f337597156005cf3b692df93dbe49ab1d4
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 a URL related to a 'battlefront 2 ps4 trophy guide'. The document body also contains this URL and numerous other links to PDF files hosted on Shopify and other domains, suggesting a link farm or SEO poisoning attempt. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be tricking the user into clicking the malicious redirector URL.

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.com/pify?keyword=battlefront+2+ps4+trophy+guide
    • http://gikodeke.jonjohndesign.com/uploads/1/3/2/8/132814930/fivujigusif_wazituwofiba_zavesa.pdf
    • http://files.perthbiblechurch.com/uploads/1/3/1/4/131437948/fa016c0f62b226.pdf
    • http://natuduved.bostonunitycup.com/uploads/1/3/1/4/131437623/8509399.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/5982/2243/files/sabixadizun.pdf
    • https://cdn.shopify.com/s/files/1/0431/1810/0637/files/linkin_park_don_t_stay.pdf
    • https://cdn.shopify.com/s/files/1/0434/3853/8904/files/fexodutaj.pdf
    • https://cdn.shopify.com/s/files/1/0430/4489/6917/files/asus_multiframe_software.pdf
    • https://cdn.shopify.com/s/files/1/0437/1267/5995/files/7151652239.pdf
    • https://cdn.shopify.com/s/files/1/0435/3087/9125/files/lologavopobibojozibo.pdf
    • https://cdn.shopify.com/s/files/1/0433/4357/7256/files/27789236569.pdf
    • https://cdn.shopify.com/s/files/1/0437/7280/5277/files/buxidif.pdf
    • https://cdn.shopify.com/s/files/1/0431/4464/2716/files/63210186558.pdf
    • https://cdn.shopify.com/s/files/1/0431/4388/9058/files/dofenedezifonezorol.pdf
    • https://cdn.shopify.com/s/files/1/0430/6511/4775/files/45160711424.pdf
    • https://cdn.shopify.com/s/files/1/0432/6536/0027/files/arabesque_piano.pdf
    • https://cdn.shopify.com/s/files/1/0429/6382/8895/files/rujevumuleredogisi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000053aa.bin
125390714ae03e759eaf0f0e495c628bfd7fdf0677f9259b02a38b82e3eef410		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53AA 5556 bytes
font_01_sfnt_off00006694.bin
03308e00e27c7f4f6e061ab57c96d18262d12a493e2595619d56d62be5c9f1e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6694 11576 bytes
font_02_sfnt_off00008c94.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C94 4324 bytes

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