Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e1d00656d21be95…

MALICIOUS

PDF

40.8 KB Created: 2020-08-14 07:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00122df365744d5465aabdb19d157562 SHA-1: ee2077d9b400b9157d90cd5a5586511f5635c78b SHA-256: 6e1d00656d21be95f234f6235bbc5f5086b84b3793f53d3d979fe934f0e9e179
202 Risk Score

Malware Insights

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

The sample is a PDF document that contains multiple embedded URLs, including one identified as a malicious redirector. The document body and heuristics indicate a social engineering lure, specifically a 'browser installation lure' and a 'download button', suggesting the user is prompted to click a link to view content. The presence of a malicious redirector URL strongly suggests the intent is to lead the user to a malicious site for further exploitation or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.ru/wb?keyword=pdf%20to%20word%20converter%20online%20small%20pdf
    • http://notula.preferredagent.org/uploads/1/3/1/8/131871590/puvujanixab.pdf
    • http://wonesasit.jorricmatthews.com/uploads/1/3/2/3/132302780/c8e55b1c.pdf
    • http://files.jerostique.com/uploads/1/3/2/7/132740553/135078.pdf
    • http://wivarunel.clarkhsu.com/uploads/1/3/1/4/131482975/xosuv_sefemixiv_xizejagewasaked_rorizorexa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/4347/1010/files/12018837362.pdf
    • https://cdn.shopify.com/s/files/1/0437/9561/1805/files/math_worksheets_1st_grade.pdf
    • https://cdn.shopify.com/s/files/1/0437/3551/5290/files/33605642092.pdf
    • https://cdn.shopify.com/s/files/1/0436/4759/8742/files/best_sites_to_watch_movies_and.pdf
    • https://cdn.shopify.com/s/files/1/0433/7877/0078/files/ripijona.pdf
    • https://cdn.shopify.com/s/files/1/0432/9114/8444/files/convert_base64_to_angular_4.pdf
    • https://cdn.shopify.com/s/files/1/0431/0335/5034/files/52400786717.pdf
    • https://cdn.shopify.com/s/files/1/0440/8963/9077/files/84628505899.pdf
    • https://cdn.shopify.com/s/files/1/0428/7699/3695/files/inches_to_meter_conversion_chart.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_off000061ad.bin
70528fc5cd20b0f61b133a6134d3c567135d58be3d374bd06dc7e037e388dc6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61AD 5452 bytes
font_01_sfnt_off00007437.bin
70f2e3de420927270afc46ca9772e9548026353372222b918014a7fedd0a1b46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7437 10008 bytes

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