Malicious PDF — malware analysis report

Static analysis result for SHA-256 51ab0f556e66868d…

MALICIOUS

PDF

39.2 KB Created: 2020-10-25 09:22:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 42a67ee513c8538b79311021cc56060b SHA-1: 16a6ef1746020e1a2b8abc1eade17ea4d4ceaaa6 SHA-256: 51ab0f556e66868de3c213755bf854aa15c38d6fcc6e08315eca731a823ba5a9
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to redirector infrastructure and a link farm, indicating a malicious intent to drive traffic to potentially harmful sites. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains URLs that are likely part of this redirection scheme.

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://ttraff.me/123?keyword=solving+systems+of+equations+with+matrices+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366045/normal_5f873c41551b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369763/normal_5f8ba9caa491a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371261/normal_5f88b4d6582e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368235/normal_5f8de78f25fe3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365594/normal_5f87195aa9182.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369524/normal_5f91ab14ca6a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369146/normal_5f8f63be500c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365540/normal_5f872d0ae3132.pdfIn PDF document text
    • https://vatalinonabalix.weebly.com/uploads/1/3/4/2/134234662/fimirajukisuf.pdfIn PDF document text
    • https://gobumireg.weebly.com/uploads/1/3/1/3/131383916/6ca2b4.pdfIn PDF document text
    • https://buximinolid.weebly.com/uploads/1/3/1/3/131381316/8747635.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384026/normal_5f8e6325a16dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375887/normal_5f8cc633d2b63.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/zuxadol/fotavuzubaj.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/blogspot_de_libros_para_descargar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87f469a5-bd79-4e59-8247-411e76b2707a/fipakiwufoxitoderazu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ea7ec3e-a4f0-4592-bf86-fbe3ff23ff69/serial_box_2017_mac_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5244b10-6d45-41c7-a342-dbc0ccf8c1ba/8838444410.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aab74d98-8543-4e01-8b74-0e88a14fbf17/60649398780.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01e331bf-ce52-4875-90ce-68ce99e59657/tosuguximefejevomoti.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_off000057bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57BC 5844 bytes
SHA-256: 898c6d211d7ef6f0902b738002c2d10bfde3ae60f7b56feff2f0b7a210ed6ce8
font_01_sfnt_off00006b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B93 10416 bytes
SHA-256: f7e49400fdb9c38c5c1a8fdbc25f6f979645a1fc367e66b78eef0d5c51b76ceb

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