Malicious PDF — malware analysis report

Static analysis result for SHA-256 343dd9c9e6dfe008…

MALICIOUS

PDF

41.8 KB Created: 2020-08-10 19:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3d6217b7bcfb0870b29e6a08c4fa4788 SHA-1: cbccaf2e9b4269e1c3fbe5bf49fa55ebdca248b3 SHA-256: 343dd9c9e6dfe00878f62547d88131a18a7690c53524d8d8f81dc1e44864e9c7
162 Risk Score

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same URL and a lure related to 'Azure cloud architecture pdf'. The ML_NYX_PDF_MALICIOUS heuristic also strongly indicates malicious intent. The presence of embedded URLs and the nature of the redirector suggest an attempt to lead the user to a malicious site, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=azure+cloud+architecture+pdf
    • http://files.alpinespringscounseling.com/uploads/1/3/1/0/131070011/marisipitigurarero.pdf
    • http://files.adjoaoseipsyd.com/uploads/1/3/1/6/131636828/kofir-zegokil-vaxilo.pdf
    • http://files.jaynardiscounts.com/uploads/1/3/0/9/130969384/ecec3508f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5265/5004/files/interesting_facts_about_the_world.pdf
    • https://cdn.shopify.com/s/files/1/0431/5129/4619/files/jurnal_apetalae.pdf
    • https://cdn.shopify.com/s/files/1/0438/2621/7120/files/discord_code_block_color.pdf
    • https://cdn.shopify.com/s/files/1/0437/6697/2577/files/nc_dmv_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0435/0319/0180/files/23691190503.pdf
    • https://cdn.shopify.com/s/files/1/0429/2483/4975/files/pedoxujemiziduradenafagut.pdf
    • https://cdn.shopify.com/s/files/1/0432/0041/3856/files/lunapifurexeresi.pdf
    • https://cdn.shopify.com/s/files/1/0434/3644/1752/files/lazos.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38030937597.pdf
    • https://cdn.shopify.com/s/files/1/0432/7571/4715/files/javascript_to_lowercase.pdf
    • https://cdn.shopify.com/s/files/1/0433/6815/3239/files/83506126159.pdf
    • https://cdn.shopify.com/s/files/1/0438/2910/0701/files/ludibesuje.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_off00006649.bin
3e6e0a0ba53f994dfe655d2445e86f715a2143c718d4520ac05779d61a75a2ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6649 5104 bytes
font_01_sfnt_off000077a5.bin
233a296319430efe44e962969325a290542a4e133841c9b85c6b5ec9c529f16e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77A5 10224 bytes

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