Malicious PDF — malware analysis report

Static analysis result for SHA-256 937a5266cea3527f…

MALICIOUS

PDF

60.0 KB Created: 2020-10-28 01:18:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7f4ef2b10e9a73c6f68dd1af007e4ca SHA-1: ef76e37c5641b93cfd1f806e034bae98941208e9 SHA-256: 937a5266cea3527f5630b6a2849f761b82913756f03a85f80b4f20a41c50ce78
94 Risk Score

Malware Insights

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

The PDF contains a link to known malicious redirector infrastructure, identified as a critical threat. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious redirector URL suggests an attempt to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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://cctraff.ru/123?keyword=nissan+sentra+2004+service+manual
    • https://xusawoji.weebly.com/uploads/1/3/0/7/130739635/1497626.pdf
    • https://kelipibefis.weebly.com/uploads/1/3/4/5/134500531/juraxiwipatuxil.pdf
    • https://sisaseno.weebly.com/uploads/1/3/0/7/130776680/04eb1.pdf
    • https://cdn-cms.f-static.net/uploads/4379486/normal_5f8e4e00712a9.pdf
    • https://cdn-cms.f-static.net/uploads/4374843/normal_5f8a72cfd87e3.pdf
    • https://cdn-cms.f-static.net/uploads/4371267/normal_5f8e163eec153.pdf
    • https://cdn-cms.f-static.net/uploads/4369185/normal_5f98aa48a373c.pdf
    • https://cdn-cms.f-static.net/uploads/4366348/normal_5f92962094f58.pdf
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/gafabiviwiz-mijowig-zabesoretos-fegubug.pdf
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/batagebexi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4b7a84c4-5f5c-46c0-85aa-fa560e1cb1fc/zivizisomevutimaw.pdf
    • https://uploads.strikinglycdn.com/files/267cebb2-4695-4adb-838b-a8d8ad37a362/merry_christmas_mr.lawrence_sheet_music.pdf
    • https://uploads.strikinglycdn.com/files/d7923589-d098-4039-8246-443aa659d9cb/5952265767.pdf
    • https://uploads.strikinglycdn.com/files/9053a84d-ca6d-4ff9-aaf8-1ad54c34708e/mabokerafawuvelimutaj.pdf
    • https://s3.amazonaws.com/wilugugo/xejugerik.pdf
    • https://s3.amazonaws.com/mibiwivanetuj/regrouper_plusieurs_fichiers_en_un_seul.pdf
    • https://s3.amazonaws.com/xurixado/wibageziwamulixozex.pdf
    • https://s3.amazonaws.com/gupuso/gimetidexukef.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_off0000a888.bin
9d7d9a4d74aa195d22b58f6c5ba39da73a7c3e2ef716676f33755cd2eb82f5c7
pdf-font-stream PDF embedded font (sfnt) at offset 0xA888 5336 bytes
font_01_sfnt_off0000ba99.bin
6c5a78d28a7f35b3c3b8762b66582d6677ed3dd4f5065434ed9c65ca523c5adf
pdf-font-stream PDF embedded font (sfnt) at offset 0xBA99 11176 bytes