Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fa1cebdd8303a68…

MALICIOUS

PDF

40.4 KB Created: 2020-10-06 14:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 1fd4280805b94488f860a0492bf4526a SHA-1: eab24f120f0fcb3b9bfe6ecb69267dffeba29b17 SHA-256: 0fa1cebdd8303a686f0493376293ff82f1494fa013dbb8aa8f8bd5ed88e7d60f
184 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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://ttraff.link/pify?keyword=difference+between+memory+and+storage+on+android In PDF document text
    • http://files.customsandclassicsllc.com/uploads/1/3/2/6/132696030/5505603.pdfIn PDF document text
    • http://limerib.normacowie.ca/uploads/1/3/1/3/131398504/1706889.pdfIn PDF document text
    • http://files.mrmcbrideteaches.com/uploads/1/3/0/7/130775334/111885.pdfIn PDF document text
    • http://zupid.elcohsband.org/uploads/1/3/1/4/131482975/5689545.pdfIn PDF document text
    • http://jowit.saundersfarmessentials.com/uploads/1/3/1/0/131070420/d124af5c9eec9.pdfIn PDF document text
    • http://dufoki.sbarcperformancehorses.com/uploads/1/3/1/6/131637354/234ba6b.pdfIn PDF document text
    • http://files.llmadridmakesthingsup.com/uploads/1/3/2/7/132740329/1ea33701929dde9.pdfIn PDF document text
    • https://site-1039409.mozfiles.com/files/1039409/40989701336.pdfIn PDF document text
    • https://site-1037077.mozfiles.com/files/1037077/tugavonokifazilesub.pdfIn PDF document text
    • https://site-1038455.mozfiles.com/files/1038455/jisolivuwumezibudemu.pdfIn PDF document text
    • http://gutaxoraj.houseofbellator.com/uploads/1/3/0/7/130775176/3ecf9f8.pdfIn PDF document text
    • http://files.nityakumar.com/uploads/1/3/0/8/130874369/fivevuze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00005fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FDA 5640 bytes
SHA-256: 55465a9586f3be3606c6021664fa494d994628e23dd7f6d15ad06835f424ce5f
font_01_sfnt_off00007311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7311 9764 bytes
SHA-256: 56f5502ea65921737fea7999b21079ed9f4d5624e201d22da1e977007d003865