Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e37a5a913f92fce…

MALICIOUS

PDF

41.2 KB Created: 2020-10-02 22:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 51846cd3b789dba2a19e2deb090a71cb SHA-1: ad9a545af92321e40861df6dcf23e0dda57f75d3 SHA-256: 8e37a5a913f92fce10c497c02045025b5056881c37667332f846d94ce324d572
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The ML classifier strongly indicated maliciousness, and the document structure suggests it's part of a link farm designed to drive traffic to potentially harmful sites. The embedded URLs are the primary indicators of malicious activity.

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://gettraff.ru/strik?keyword=area+de+figuras+compuestas+ejercicios+resueltos In PDF document text
    • https://site-1038794.mozfiles.com/files/1038794/rafufobijevixubeluba.pdfIn PDF document text
    • https://site-1036872.mozfiles.com/files/1036872/97823397296.pdfIn PDF document text
    • https://site-1036636.mozfiles.com/files/1036636/vonuvojopabe.pdfIn PDF document text
    • http://files.towniebookscb.com/uploads/1/3/1/4/131453588/wotuza-pizavikufiz-damima-siwolupota.pdfIn PDF document text
    • http://files.jake-schick.com/uploads/1/3/1/3/131398385/nejidivi.pdfIn PDF document text
    • http://lasuran.deaconvernon.com/uploads/1/3/1/3/131398069/1d995e1.pdfIn PDF document text
    • http://files.butsavageracing.com/uploads/1/3/1/0/131070402/63e83dc8a2.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/f0a5586a-2a38-4dc9-a3af-f6216b7df023/xeridewa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/719ddbed-306f-49cc-8daa-3bb14502dfb7/bukidupigolas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66a7201b-afb6-4e23-b7f2-0bb57a508f62/62532150593.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_off0000610e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x610E 5540 bytes
SHA-256: 6022535bb931d1e539ef7acdf227aa7a4c1fb76f73b01e808a453b057b1432fb
font_01_sfnt_off000073db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73DB 11212 bytes
SHA-256: d41b7adc21ee3dcb623ff5712cc946cc6942d1d229bcb6d13837ff14fbf5f791

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