Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1ae1f4f788319f2…

MALICIOUS

PDF

37.0 KB Created: 2020-11-05 19:59:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 535fcac5bd008ea342c23ab8d5ebe8fb SHA-1: 140b9f38d06a2a0b7ca445193e9fc3c81391d57e SHA-256: f1ae1f4f788319f2bc205de509d93f6312945ab66ec44b79764771b86adeaccf
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The document body, though heavily obfuscated, contains URLs that are also present in the list of extracted URLs. The primary purpose appears to be directing users to a network of external websites, potentially for malicious purposes such as phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=pba+2k19+apk
    • https://fulipevaxavu.weebly.com/uploads/1/3/2/6/132695351/397400.pdf
    • https://povutepumik.weebly.com/uploads/1/3/2/7/132741486/poralizetugit.pdf
    • https://buvitefano.weebly.com/uploads/1/3/4/1/134131500/e3dafba.pdf
    • https://lokixesope.weebly.com/uploads/1/3/1/6/131607163/fugebum_zejisuzeputug_bumuvokoponul.pdf
    • https://nipufijupetobug.weebly.com/uploads/1/3/1/4/131482996/2778091.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e3aca1a5-f4f7-45c5-883c-333bf197f6e3/puxilezixoguxovo.pdf
    • https://uploads.strikinglycdn.com/files/78e92af6-ae76-4df2-b4fd-81371ae3675f/buzanatimog.pdf
    • https://uploads.strikinglycdn.com/files/8562b0d8-9d28-4542-bd62-999a015ca17b/ruvuzirevidirevupijuxet.pdf
    • https://uploads.strikinglycdn.com/files/6ff97988-168a-47d8-98e6-a061449a9285/rimugefimuremugagu.pdf
    • https://cdn.shopify.com/s/files/1/0504/7087/9397/files/koxarun.pdf
    • https://uploads.strikinglycdn.com/files/e35f4c10-d163-4d4b-a562-e07d0e8a05ee/lukaxoxigarutuzavube.pdf
    • https://uploads.strikinglycdn.com/files/c92fc8a6-0521-41ed-8a44-77b20836c11a/bojezop.pdf
    • https://uploads.strikinglycdn.com/files/db610788-6836-47a1-97d2-5a55516f84f1/vuvuzava.pdf
    • https://uploads.strikinglycdn.com/files/8505ef6d-1ef2-49d7-9041-0150effcdc25/86472101141.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_off0000533c.bin
1c7b588545f74501182fe59fa041811be06d23fa54b39b4bd21f5dcee975a686
pdf-font-stream PDF embedded font (sfnt) at offset 0x533C 5052 bytes
font_01_sfnt_off00006488.bin
5130c20eeeae8b5d9c8ccf25f69a4554ed5a2044680c13a39d7731d02cc0497b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6488 10280 bytes