Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef69ecbcba46f06b…

MALICIOUS

PDF

50.9 KB Created: 2020-10-29 13:39:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b53f08f669fb7de5647b504810f366ac SHA-1: 71e03896a07598be2a95b7f1d6f35e112385dfad SHA-256: ef69ecbcba46f06bdfff23e8fee0b1232c21754f70f01538ce4e303859e19f49
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many pointing to S3 buckets and other file-sharing services, which is characteristic of a PDF link farm. One critical heuristic identified a link to known malicious redirector infrastructure at `https://gettraff.ru/aws?keyword=on+the+mode+of+existence+of+technical+objects`. The ML classifier also strongly indicated maliciousness. The document body itself is largely obfuscated but contains the aforementioned URLs.

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://gettraff.ru/aws?keyword=on+the+mode+of+existence+of+technical+objects In PDF document text
    • https://dedotomonifagax.weebly.com/uploads/1/3/1/6/131606429/2446307.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371799/normal_5f8b62df640aa.pdfIn PDF document text
    • https://voxapinave.weebly.com/uploads/1/3/2/7/132740917/9476621.pdfIn PDF document text
    • https://zufugorutamivas.weebly.com/uploads/1/3/4/4/134401118/5755404.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424991/normal_5f9a56c7c8d77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374984/normal_5f97401adeb63.pdfIn PDF document text
    • https://wesujugureju.weebly.com/uploads/1/3/0/8/130874517/6494760.pdfIn PDF document text
    • https://xogexemufak.weebly.com/uploads/1/3/1/4/131437987/3916656.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369640/normal_5f983f231d78e.pdfIn PDF document text
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/a917684.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372085/normal_5f88b53a15966.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/rozebofukixus/bug_juice_drink_ingredients.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/diagnostico_situacional_concepto.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/capitalization_quiz.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/26484558141.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4a1fd60-d44e-417d-82fa-636b870d5906/66396185780.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/60502728631.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/zirevadasutokisubevufexe.pdfIn PDF document text
    • https://s3.amazonaws.com/wuniku/mechanical_engineering_company_profile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f0768e6-bba1-4bda-a84e-5e82b3aeefae/bibuve.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/dd_3.5_magic_armor_enchantments.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0deb34e-f315-4de5-bace-cd86f2daafc4/zemejokavabepadesolol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b2fdf7e-f5d8-4084-ac6e-491478de63a9/8_hp_tecumseh_engine_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e340524-ae4e-4b38-bc53-676f53d07795/90072920378.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/73973790764.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8694 5476 bytes
SHA-256: af3f774472fb7f0a503724d9960cbb8c48cdf222804867c165410e4a3f8877a9
font_01_sfnt_off00009918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9918 10852 bytes
SHA-256: ff2cbb6943dd9ffd4154f9fcb320259240408979ea3f59da22ec6d054d6f5789

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