Malicious PDF — malware analysis report

Static analysis result for SHA-256 d47a9b11f7022b0e…

MALICIOUS

PDF

41.6 KB Created: 2020-10-05 03:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 85a21a7d3396e9e74f604b9dc1400d89 SHA-1: 8006743a3fa19c63167e874b6ae5ac1c84c9a345 SHA-256: d47a9b11f7022b0e6e2ba4b701245eb5ce15c15445c211eca3814f1937c08a68
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'castle clash mod apk free', suggesting a lure for potentially unwanted software. The presence of multiple external PDF links further supports the SEO link farm heuristic.

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/strik?keyword=castle+clash+mod+apk++free In PDF document text
    • http://fokadumiv.vanessa-culver.com/uploads/1/3/0/7/130739220/zizobapapu-naboguwaf.pdfIn PDF document text
    • http://dukefised.2guyspies.com/uploads/1/3/2/3/132302780/vivutunalovimuvak.pdfIn PDF document text
    • http://sedikux.riveroakslearningcenter.com/uploads/1/3/0/9/130969596/kefivanuz_xivijivuvekilez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c6e700a-26ae-439f-aecc-6f028dca7435/kejekazibopazirezaxamo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46feb0b3-5ee5-4a15-96e8-a07a5a860bb1/jorovinitusoxopibe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42b5274c-3b7b-4055-a5e5-31590008304e/wibezisi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0772/0094/files/student_teacher_introduction_letter_to_parents.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e885fd05-e19e-4e64-b415-e0d6232f8d00/5851037596.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ea7a63c-757a-4f03-93ff-71f86304d725/rumumi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60af1aba-859d-4458-bb0c-3df5d7306e0f/67982741670.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02a7e217-a05d-437e-9555-d0f72597a44f/wagamulixorozibobe.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_off000063ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63EA 5364 bytes
SHA-256: 46a38ce3202310385d4e112092c46d19a3038b16ee4039360c7a14cbaae0dde9
font_01_sfnt_off000075fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75FC 10548 bytes
SHA-256: fc29c6e163407c70f27a9cc6a2205fa40f3bd585c6af27308dc7903bec7a471a

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