Malicious PDF — malware analysis report

Static analysis result for SHA-256 eebfe677c93ae387…

MALICIOUS

PDF

43.4 KB Created: 2020-09-19 04:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25738d283f35d5b2c2eb77e74cf3a467 SHA-1: fe885fc4673bf56948ce83f9f9fff43e45d0364c SHA-256: eebfe677c93ae38751e81fc9990f2470a02d86958359417e39137459b168e069
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a prominent link that redirects to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text suggesting a 'review manual pdf download' lure, and the PDF_SEO_LINK_FARM heuristic indicates a large number of embedded links, likely for SEO manipulation to increase visibility. The ML_NYX_PDF_MALICIOUS classifier strongly supports the malicious nature of this document.

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/wix?keyword=are+5+review+manual+pdf+download
    • https://0b7110a8-bf06-4f93-8e4e-2d2b9b89de6f.filesusr.com/ugd/221eaa_e5b89f4a87f2435d8bcdbee05ad56750.pdf?index=true
    • https://12839eed-907b-4bf1-88ba-dd8ea023d9f5.filesusr.com/ugd/93c935_685c07658f634c5b831855d88c3f45d6.pdf?index=true
    • https://321c5bbb-1017-403a-b573-27c644f5f993.filesusr.com/ugd/956c05_317821e2a1e24ec6afc3bbec3ad909e4.pdf?index=true
    • https://3be3697d-7398-499f-a7e6-a99296825d98.filesusr.com/ugd/237bf7_9e217bab72124f8fb09bc5a2d3913dce.pdf?index=true
    • https://c5053971-0fdd-45d4-942b-951bfa15fd1e.filesusr.com/ugd/3eed2b_7e696351f34b4be9add2f708bdee97e5.pdf?index=true
    • https://a839446c-33f1-4011-8cec-647f2cd88f45.filesusr.com/ugd/38eac1_63f14b3b257f466ba019821bac55fdea.pdf?index=true
    • https://289559ec-14c3-4c00-a6ad-768174b8faf1.filesusr.com/ugd/dba42a_504770f8c0de4e8fb06d04ed2377dc52.pdf?index=true
    • https://35d5097c-3ed8-4f95-925b-453be9d9a9c0.filesusr.com/ugd/9e53d4_d82a1ae4243d49fab4697d42c28dba03.pdf?index=true
    • https://7abc261a-3a26-4463-8186-a1b15fa7983a.filesusr.com/ugd/d4c4cf_ca0b80ce05ac4f6cb855029331903037.pdf?index=true
    • https://1c8359ca-a8fe-4b9d-9afd-84ebce711f57.filesusr.com/ugd/e9cba9_31afa0508f7a415cab4e094e1cbd0090.pdf?index=true
    • https://91fd1555-6719-46bf-8a6f-6e5e4345b9ab.filesusr.com/ugd/65e777_2ebb15cbcfe04747a9fdad4bf1c56af0.pdf?index=true
    • https://fa567ea5-449e-40ce-804d-5cb250ae16d4.filesusr.com/ugd/eda9ba_7321c1eb82044db78dd61840bbbf157c.pdf?index=true
    • https://2426df8b-09f3-4858-90ad-0e50b30f9f0a.filesusr.com/ugd/bc4951_e81d9dddb59f4bcd9f1f5ea493af167d.pdf?index=true
    • https://dace09a5-74bf-41fe-91ed-5bc49a97f99d.filesusr.com/ugd/dc98cc_1a45d22644b745d5ba5cf023deeb8aa3.pdf?index=true
    • https://b5215d5f-cc01-4588-bc20-00007ec36a4d.filesusr.com/ugd/430cb2_55c8ca1b3686481780ad6ab8f5e9bb87.pdf?index=true
    • 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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ae1.bin
b8b607f4baa7f13c3147bc525afd0a08f238dd0c3e0d6ba50e1bb3004c801029		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AE1 5276 bytes
font_01_sfnt_off00007cd9.bin
03a5951ca1a1a23420406a2029a62dd469f6c1a6632c64a1d038d264cb9dc50f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CD9 10600 bytes

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