Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8b467d3081c827c…

MALICIOUS

PDF

45.7 KB Created: 2020-10-31 17:58:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ed44b98d3c867c1da087f8c7b41e33c SHA-1: 5ddb4f0d3d70c11c84ab8fad73997932a8f627be SHA-256: e8b467d3081c827ca4569da6766bb0a29f08277c1f32fe56054dc5b428389363
102 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body also contains text suggesting a 'download' lure, further supported by the SE_DOWNLOAD_BUTTON heuristic. The ML_NYX_PDF_MALICIOUS classifier strongly indicates malicious intent. The primary IOC is the malicious redirector URL.

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.
  • 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.me/123?keyword=secondary+dominants+worksheet
    • https://tisatazufewuvo.weebly.com/uploads/1/3/1/1/131163687/865d9ed6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/podawakumepewez/properties_of_matter_worksheet_3rd_grade.pdf
    • https://cdn.shopify.com/s/files/1/0496/7756/6109/files/lefeseniji.pdf
    • https://uploads.strikinglycdn.com/files/7f44ab0f-97b7-41f8-be95-66bb5408351c/peruradinewagexu.pdf
    • https://s3.amazonaws.com/sabegokek/relative_clauses_exercises_with_answers_advanced.pdf
    • https://cdn.shopify.com/s/files/1/0505/0600/6692/files/watch_edge_of_tomorrow_online_free.pdf
    • https://cdn.shopify.com/s/files/1/0499/6556/4057/files/wororutexetiludamuxo.pdf
    • https://s3.amazonaws.com/nowokil/56922059474.pdf
    • https://uploads.strikinglycdn.com/files/a5b7c8a6-8f73-45c3-aa10-a99150bd9afe/meribumomodi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5106/5242/files/steininger_hematology_free_download.pdf
    • https://s3.amazonaws.com/liwafo/29032121916.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_off00005c65.bin
8425f11f17617dbafa59cfb020fddea105b6b1738fa60a869835feb7eb9faaf7
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C65 5508 bytes
font_01_sfnt_off00006f0a.bin
543f0d2c2679fb61a1b5e041666431be985a537f6ccd41c915751ff28d92cb65
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F0A 10848 bytes
font_02_sfnt_off00009470.bin
73e2bae015806fcbcea00a5e77fef36cf57312733aebee32ba98308b5ce41d75
pdf-font-stream PDF embedded font (sfnt) at offset 0x9470 16120 bytes