Malicious PDF — malware analysis report

Static analysis result for SHA-256 cefbe07b53c7da52…

MALICIOUS

PDF

37.0 KB Created: 2020-07-08 15:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: f7af979ec08daf22363df9c3e602e9d6 SHA-1: 5b052ac2580ac5668f59a387f7c3741dafc85a79 SHA-256: cefbe07b53c7da520fbbd70e9c325b4b7d7a385bcd5e65db3fd4f4eaa33db031
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to a link farm designed to mimic search results for a specific book. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which likely serves as the initial stage for delivering further malicious content. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted from this sample.

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.com/wb?keyword=ashcraft%20pediatric%20surgery%207th%20edition%20pdf In PDF document text
    • http://files.atlantadentalanesthesia.com/uploads/1/3/1/4/131455883/najikenusapijevofifu.pdfIn PDF document text
    • http://files.canalsigling.com/uploads/1/3/1/3/131383018/8717392.pdfIn PDF document text
    • http://files.camera1.ca/uploads/1/3/1/3/131380413/pizixejawij.pdfIn PDF document text
    • http://files.pdxprays.com/uploads/1/3/1/3/131383018/wikixawasagi.pdfIn PDF document text
    • http://files.msurunningclub.org/uploads/1/3/1/1/131163705/3613414.pdfIn PDF document text
    • http://files.studentprivacy.org/uploads/1/3/2/6/132695572/fidozilagofe-lenutabudoma.pdfIn PDF document text
    • http://files.inneriversom.com/uploads/1/3/2/7/132740525/154488.pdfIn PDF document text
    • http://files.ninelivestwine.com/uploads/1/3/0/8/130874629/vezik_gunefitotokek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://jukawuf.files.wordpress.com/2020/06/77060601672.pdfIn PDF document text
    • https://nebugaxujov.files.wordpress.com/2020/07/40510467983.pdfIn PDF document text
    • https://xexuxapal968988247.files.wordpress.com/2020/06/dukeretimogopoxozu.pdfIn PDF document text
    • https://paxologon.files.wordpress.com/2020/07/48349725611.pdfIn PDF document text
    • https://gijifibu.files.wordpress.com/2020/06/toliwaralowesifudavavip.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000514a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x514A 5440 bytes
SHA-256: feaa04aee26c38c8743588455985f55ac912d20788100439cd6f58d539662d05
font_01_sfnt_off000063d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63D3 10320 bytes
SHA-256: 5898795c7824ee6c7fff1de4ae98f8961993ab699830b90d8e1cafb61d080f73

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