Malicious PDF — malware analysis report

Static analysis result for SHA-256 65e8c132ce2d6be7…

MALICIOUS

PDF

44.7 KB Created: 2020-08-10 14:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0789d806d93b17fcaf591a5cdfccfd90 SHA-1: 937718899089efc8f2ec73c0ab5fc8964556916f SHA-256: 65e8c132ce2d6be7b866cf27364e01f665d8caf7a35ddcd3f560ea457269c38a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with the primary redirector URL identified as malicious. The ML classifier strongly flagged this PDF as malicious. The document body, though obfuscated, contains the malicious URL, suggesting an attempt to lure users to external content.

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=behavioral+neuroscience+pdf+breedlove
    • http://files.dalewoodbaptistpdo.org/uploads/1/3/2/8/132815367/guzoxopajale.pdf
    • http://muwareseb.outreachministrieschurch.com/uploads/1/3/1/4/131453062/7aa24947.pdf
    • http://nuxino.offthebeamwoodworking.com/uploads/1/3/0/8/130814238/8505670.pdf
    • http://files.avianoreunion.com/uploads/1/3/1/6/131606256/5327800.pdf
    • http://vuvipet.eastbroadwaypta.com/uploads/1/3/1/6/131636725/9703248.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/2457/9736/files/11177692745.pdf
    • https://cdn.shopify.com/s/files/1/0434/3929/2577/files/64744414600.pdf
    • https://cdn.shopify.com/s/files/1/0428/6201/8716/files/24715400471.pdf
    • https://cdn.shopify.com/s/files/1/0432/8987/0491/files/10839152486.pdf
    • https://cdn.shopify.com/s/files/1/0433/8457/0019/files/psp_chet_codes.pdf
    • https://cdn.shopify.com/s/files/1/0431/9005/9176/files/90546386131.pdf
    • https://cdn.shopify.com/s/files/1/0431/8330/8955/files/zulobomigodukuveli.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/81792980332.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/3155511773.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6976/files/81248460491.pdf
    • https://cdn.shopify.com/s/files/1/0430/6554/0759/files/15877706255.pdf
    • https://cdn.shopify.com/s/files/1/0430/8094/1729/files/craftsman_dys_4500_owner_s_manual.pdf
    • https://cdn.shopify.com/s/files/1/0438/6163/9318/files/30587251362.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_off00007071.bin
ffcf3aab6089f030e8e626cdcdb2881cf2f52d55bd318a2653d10450e2d6c22c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7071 5492 bytes
font_01_sfnt_off00008312.bin
397c2b242c422659bb39adce57d9b8fe55b0c30b6e3b091296063945242088e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8312 10044 bytes

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