Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c491ed94f0e7411…

MALICIOUS

PDF

42.6 KB Created: 2020-11-06 05:36:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: f8f6009d6bc312fc54ddcb4f1741a9fe SHA-1: 17aed4af7a22aa878d49b65eef972ea8cee04900 SHA-256: 5c491ed94f0e74111177cb573f892e22d3a258973dd12829e67365bbdc947413
124 Risk Score

Malware Insights

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

The PDF document contains embedded links that lead to known malicious redirector infrastructure, specifically targeting users searching for 'vivavideo download apk'. The ML classifier strongly indicated maliciousness, and the document structure suggests it's part of a link farm designed to distribute malware or facilitate phishing. No scripts were extracted, but the presence of multiple links to potentially disposable hosting services points to a common distribution tactic.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffking.ru/123?keyword=vivavideo+download+apk In PDF document text
    • https://zadujemerumid.weebly.com/uploads/1/3/2/6/132695269/908035.pdfIn PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/3888180.pdfIn PDF document text
    • https://runebipunozup.weebly.com/uploads/1/3/1/4/131406604/4599586.pdfIn PDF document text
    • https://mefemanodi.weebly.com/uploads/1/3/1/4/131454269/7439702.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369503/normal_5f89cd53844a6.pdfIn PDF document text
    • https://pawasisuleti.weebly.com/uploads/1/3/4/6/134652657/78be016b774829.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366055/normal_5f872d628d885.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/buganabowumujef/57468078780.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1dd56e7-c790-4966-afd8-f1f36e3e1a39/vajuxutase.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/779abed9-96dd-4b5c-a7fc-2108a5454e96/anker_soundbuds_sport_nb10_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bd5aac9-edd1-4333-b44e-6a660ad17de4/17591915136.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/pogabebukegenel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27c451ca-21e2-49fb-9f1e-3ccc1fe4e590/archivos_de_audio_a_texto.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_off00006835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6835 4860 bytes
SHA-256: f9a17bc16d0ea3a043dbd4f504c3d94ff6b404d340d80ad667e7e1bd0c00a1d0
font_01_sfnt_off000078ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78EE 10904 bytes
SHA-256: a9d83ed37b99d59f4dc15a32bdfbcb36d3e2c3ddb9dcbbedbcc3642a8a86d402

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