Malicious PDF — malware analysis report

Static analysis result for SHA-256 69bbc91d8dfe8521…

MALICIOUS

PDF

47.7 KB Created: 2020-08-28 14:17:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9eae33698c682bfb9aa34ad999f7a04 SHA-1: 7bdceddf2139c3d6e1cdb1c66aec08d1c187d716 SHA-256: 69bbc91d8dfe8521eb5ec30106a97198e249f8ac74256f6b4917c41606ea6de1
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector service, which is a common tactic for delivering malicious content. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, and the presence of numerous other links suggests a link farm or SEO poisoning attempt. While no scripts were explicitly extracted, the PDF structure and embedded links indicate a malicious intent to redirect the user to potentially harmful 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.me/pify?keyword=alien+skin+exposure+7+presets
    • http://files.redcrosstrainingclasses.org/uploads/1/3/1/1/131164260/1502169.pdf
    • http://files.buildingblocksnorfolkva.com/uploads/1/3/1/8/131857305/5244530.pdf
    • http://files.klausriis.com/uploads/1/3/0/7/130775853/ce518.pdf
    • http://kavuvo.melaniebates.net/uploads/1/3/1/4/131438860/lenexome.pdf
    • http://files.jaxsinglesgolf.com/uploads/1/3/2/6/132682647/8d03e2768c0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3124/8541/files/19369291469.pdf
    • https://cdn.shopify.com/s/files/1/0436/7430/4662/files/4102865377.pdf
    • https://cdn.shopify.com/s/files/1/0429/7896/7703/files/21070057402.pdf
    • https://cdn.shopify.com/s/files/1/0432/6617/9230/files/nomefele.pdf
    • https://cdn.shopify.com/s/files/1/0428/7512/5923/files/buxalulizevudok.pdf
    • https://cdn.shopify.com/s/files/1/0440/1918/7862/files/international_paper_company_annual_report_2017.pdf
    • https://cdn.shopify.com/s/files/1/0431/0827/0244/files/sheetal_gajak_online.pdf
    • https://cdn.shopify.com/s/files/1/0430/8946/1410/files/50431422827.pdf
    • https://cdn.shopify.com/s/files/1/0430/1655/2605/files/vidmate_status_video.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065fc.bin
cd9cd286b51033d5d3759dc42a5ae0b6e3cf35d0e6e3314273a17a75124f6cd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65FC 4804 bytes
font_01_sfnt_off0000766d.bin
0b676853a2c243b06c0406438f3c33ddf1a6aee83323a0b8f3ffea205a6a208b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x766D 10532 bytes
font_02_sfnt_off00009ab7.bin
0c82561ead172ac0e51412abe629b5944d5f81f469066018c017fef234fe4ba7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AB7 16388 bytes

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