Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e30bcd818b3768c…

MALICIOUS

PDF

52.4 KB Created: 2020-11-08 10:02:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: cbf985ace12f80447ae7ee1276d93337 SHA-1: e73f06bc698add1514a2cf64d8f6c2c8049d3112 SHA-256: 1e30bcd818b3768c8a80c00ff664ae75f67c4dcb613fcabf7f10f2f5f6f87d46
144 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains numerous external links, many of which are to PDF files hosted on S3 buckets and WordPress.com, suggesting a link farm or SEO poisoning attempt. The document body contains a URL that appears to be a lure for downloading 'synapse x'. Crucially, the sample includes an instruction to disable security software, which is a high-risk indicator. While no scripts were directly extracted, the PDF structure and the presence of external links suggest it may exploit vulnerabilities or act as a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffine.ru/123?keyword=synapse+x+download+rar PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403818/normal_5f95f6cf64eca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445864/normal_5f9d3cf4875fa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/janozetifovokisaba.pdfIn PDF document text
    • https://gozevawu.files.wordpress.com/2020/11/disaxilofotunazuxofexatab.pdfIn PDF document text
    • https://momuvabixot.files.wordpress.com/2020/11/54058297776.pdfIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/earn_to_die_3_unblocked_6969.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/zomowevowuderarusaritixe.pdfIn PDF document text
    • https://jowubopoxolo.files.wordpress.com/2020/11/fast_and_furious_8_album_download.pdfIn PDF document text
    • https://gawidomer.files.wordpress.com/2020/11/30759717122.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/hyperbola_calculator_graph.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/vajoxateki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/791b7d2e-5c29-4343-8562-f4a1d1fe53b7/zumimov.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/27623034894.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000547f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x547F 6424 bytes
SHA-256: e637e929042e3978bec96b31b3490ba660419ed310d31d627162007a830036f1
font_01_sfnt_off00006460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6460 5316 bytes
SHA-256: dca99515fd21bca4928109457c5fcc27ccb898983c25e77328d0b173e8a63eb6
font_02_sfnt_off00007694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7694 3656 bytes
SHA-256: 304e644291c75a74f6e08873ab2ecae09db52d8d087d7da3a7662b18b9f68f25
font_03_sfnt_off00008523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8523 11120 bytes
SHA-256: 4e016422b2c39023205993c302ee2f213fb4990a9fb2127b1cff8942662bcc46
font_04_sfnt_off0000ab81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB81 16536 bytes
SHA-256: ccd3331f9d5959250e8a7df12a61ebef2b8c93c2f8a01242656b530d01d4596a

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