Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b3a0c7008c18238…

MALICIOUS

PDF

43.3 KB Created: 2020-09-07 20:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39cb875292d710510aa256dd02f32aea SHA-1: 05401466674ca1c789bcaaec6ec1f1fc12dd2130 SHA-256: 5b3a0c7008c182388de1a27dc3da09557cf59bc34283d68cd8f54281a4a84eba
162 Risk Score

Malware Insights

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

This PDF document contains a link farm and a malicious redirector URL, indicating an attempt to lead the user to a harmful site. The ML classifier strongly flagged this PDF as malicious. The presence of numerous external PDF links suggests a SEO-based link farm tactic, likely to improve search engine ranking for malicious content or to distribute malware.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=malaria+treatment+iap+guidelines
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/429b25_63da17ba4e64434293bbfaede831e165.pdf
    • https://static.usrfiles.com/ugd/6cf392_42317b9bf493466b86faa295584b9d11.pdf
    • https://static.usrfiles.com/ugd/defcb2_a0ad68ee76df4c14b71c06a423703a12.pdf
    • https://static.usrfiles.com/ugd/1b7c00_aeadfbfa51fb41b98124c07a7df9c848.pdf
    • https://static.usrfiles.com/ugd/b8c837_9bff50e9c78c483594f051e38d170046.pdf
    • https://static.usrfiles.com/ugd/9cb927_152a52f7d03d4c8394f3085540dfb7a0.pdf
    • https://static.usrfiles.com/ugd/8127dd_4c7f13682eec44e28701d22417b113b3.pdf
    • https://static.usrfiles.com/ugd/756799_9ed0a55615114b30879c22abd253d449.pdf
    • https://static.usrfiles.com/ugd/55cc32_febc75581875435e9cebbbf01d9fa4bf.pdf
    • https://cdn.shopify.com/s/files/1/0430/7209/4362/files/70237102222.pdf
    • https://cdn.shopify.com/s/files/1/0429/9836/6367/files/free_microsoft_excel_gantt_chart_template.pdf
    • https://cdn.shopify.com/s/files/1/0459/9808/0157/files/red_devil_5500_paint_shaker_parts.pdf
    • https://cdn.shopify.com/s/files/1/0434/8837/9032/files/facebook_timeline_banner_template_psd.pdf
    • https://cdn.shopify.com/s/files/1/0429/7300/3939/files/bituzesevogiwugot.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5275/files/zoology_books_for_bsc_part_2.pdf
    • https://cdn.shopify.com/s/files/1/0436/1630/5312/files/afreen_tera_chehra_ringtone.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_off00006c08.bin
0c914bdf72062cc2e35dcf04636ca2d5ac62416ad18f23c3637e9fb81e83dc4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C08 5284 bytes
font_01_sfnt_off00007df2.bin
c7738c8359b374fe6ba97a3d4f65dfb6578506270b744430903ddfe6b82b00a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DF2 10052 bytes

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