Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f495310490ee421…

MALICIOUS

PDF

49.1 KB Created: 2020-08-14 02:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 68f72d64cc6a64b900ab6dc70f97ae05 SHA-1: 6b484180af7c86e5ad3c3bfcb12d0eb950c593b1 SHA-256: 6f495310490ee4212cc7736598ddfe0eca7a7a319ba92429c49bac9fa5c9f945
194 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link and a large number of external PDF links, suggesting a link farm or redirection attempt. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/wb?keyword=principios%20de%20etica%20medica%20pdf, which is also flagged as a malicious redirector. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent, likely to redirect the user to a malicious site or download further content.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/wb?keyword=principios%20de%20etica%20medica%20pdf
    • http://gigobu.southrichmondadcc.org/uploads/1/3/0/9/130969060/dirok.pdf
    • http://jelukoden.michaelbradleyatty.com/uploads/1/3/1/8/131856887/ruseb.pdf
    • http://files.thesiftertv.com/uploads/1/3/1/6/131637889/812921d0307.pdf
    • http://files.coquelicothandmade.com/uploads/1/3/0/9/130968984/55250316736c6.pdf
    • http://files.palmgrovemennonitechurch.com/uploads/1/3/1/3/131381067/lirizufufon.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0553/3598/files/ewon_cosy_131_installation_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7570/files/tenoxaburazowuxolodatab.pdf
    • https://cdn.shopify.com/s/files/1/0439/2042/5115/files/majoloxetugugidini.pdf
    • https://cdn.shopify.com/s/files/1/0436/2806/9017/files/rrb_alp_cbt_2_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0430/0275/7281/files/rofiwifadaxamima.pdf
    • https://cdn.shopify.com/s/files/1/0434/8795/3053/files/jugamisavaroxepunowoxadi.pdf
    • https://cdn.shopify.com/s/files/1/0427/4041/6678/files/mvc_design_pattern_c.pdf
    • https://cdn.shopify.com/s/files/1/0438/2566/0066/files/45305665014.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/45484104345.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_off00007e01.bin
71cabbbc76e69eb4e2a28926d995cc061256a14072e23e7afb9aa207a904118e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E01 5272 bytes
font_01_sfnt_off00008fcb.bin
ed61e174f1c57e9358a0a2f9e5cbf62ea0d366959c0985387bfb28ece05f4e79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FCB 11792 bytes

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