Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dda45a307843414…

MALICIOUS

PDF

44.3 KB Created: 2020-10-08 19:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 892a4ff88dec96cd448910cf118f311f SHA-1: e18e8289acb1806c7534400696471501770e91c3 SHA-256: 5dda45a307843414eb615ab09be99d8f1def34bca870099459bb82815ce31e2f
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which directs to a known malicious redirector associated with game cheat lures. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's part of a link farm designed to distribute malicious content. No scripts were extracted, but the presence of a malicious redirector URL is a high-confidence indicator of a phishing or redirection attack.

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://cctraff.ru/pify?keyword=last+shelter+survival+cheats In PDF document text
    • http://sedijukom.annadivesta.com/uploads/1/3/1/4/131454731/6097480.pdfIn PDF document text
    • http://wusunubew.henrymcgrane.net/uploads/1/3/2/6/132695325/ac39d41.pdfIn PDF document text
    • http://wanive.arfamilycoalition.org/uploads/1/3/1/6/131636957/safideraramed.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/a7cda025-4bd4-4135-9bf8-aef3ba91222b/75043142536.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93b696e3-6250-473b-9e04-bbaa93643616/wususatusik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2651edf7-7abc-4c1b-88b2-0ed7d813bdc7/7528848905.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75a44ceb-f52c-4638-b60f-691d77b016f3/36079939362.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e72dcd27-049b-47a8-9553-2cc0a4fc4e8f/dusupubaxifunepe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc192481-c842-4773-bc3f-1c18558831e6/61691781422.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa7f0f4e-e354-4d45-95cb-3a393d149639/38754177654.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2113891b-aaf1-4baa-8c46-8ac1cbdd2b4a/28536332557.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df637bf5-e35a-4349-9a04-e84c4d3a2824/33269735192.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/0600/3864/files/2003_jeep_liberty_manual_transmission_fluid_capacity.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/7598/9404/files/95450453245.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1990/9794/files/accounting_2_chapter_3_homework_connect.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2758/6472/files/43456206037.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_off00007083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7083 4888 bytes
SHA-256: 56c2af77b13d5b109a102a605f2530a29b70fbd92ad3dd75c5f9126b5ac88775
font_01_sfnt_off00008124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8124 10292 bytes
SHA-256: 6bfd6b5ba609923020b5a76f6ccc419fc76c499a9d490ea8a16d64aea3e42055

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