Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e4ac629ca187c0c…

MALICIOUS

PDF

42.1 KB Created: 2020-08-13 11:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72aec47eefc2638aa860540cfdfb5636 SHA-1: 59adf91bd3617a93c0f70de59bac5eb5f181c604 SHA-256: 5e4ac629ca187c0c1a9b6c0d48413b0d9226ffa8c5a65d3754d969d44727e345
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, many of which point to a link farm hosted on Shopify, and one critical link redirects to known malicious infrastructure. The document body, though obfuscated, contains the URL 'https://ttraff.com/wb?keyword=altera%20nios%20ii%20user%20manual', suggesting a lure to download further content. The ML classifier 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.com/wb?keyword=altera%20nios%20ii%20user%20manual
    • http://bavixupav.barnes1ststepft.com/uploads/1/3/0/9/130969323/4245588.pdf
    • http://files.allroundrendering.com/uploads/1/3/1/0/131070581/3bbc7dd52d8f4.pdf
    • http://files.faithinhisblood.org/uploads/1/3/0/7/130775163/9a6b260.pdf
    • http://ripibe.twinsrun.com/uploads/1/3/0/8/130814017/ef4eee.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/9336/7710/files/56117381131.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vuxopikuxoxixu.pdf
    • https://cdn.shopify.com/s/files/1/0438/2933/0082/files/jozobolorawubagilexu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1479/1069/files/88789390374.pdf
    • https://cdn.shopify.com/s/files/1/0438/9090/1144/files/antenna_definition.pdf
    • https://cdn.shopify.com/s/files/1/0437/1123/4199/files/21283859387.pdf
    • https://cdn.shopify.com/s/files/1/0434/7016/0032/files/51750106099.pdf
    • https://cdn.shopify.com/s/files/1/0430/4535/5674/files/nitowobuzepidojuz.pdf
    • https://cdn.shopify.com/s/files/1/0433/8129/3221/files/91206877918.pdf
    • https://cdn.shopify.com/s/files/1/0438/1153/7053/files/ronixozejedurotuluwaxukox.pdf
    • https://cdn.shopify.com/s/files/1/0432/9088/6299/files/72242100741.pdf
    • https://cdn.shopify.com/s/files/1/0436/5362/8062/files/68841204634.pdf
    • https://cdn.shopify.com/s/files/1/0434/3844/0604/files/jigojurekeluf.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_off00005b8b.bin
072f870eb4759eb62babae53faedc4dad694f5be92c64cdc32404d1dd59a0e43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B8B 4704 bytes
font_01_sfnt_off00006b5a.bin
a344de03b4571c2a461396a28538686e25cd83fd3deaf120de5784063f5d15c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B5A 9872 bytes
font_02_sfnt_off00008d24.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D24 4324 bytes

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